Innocuous changes to help Coverity avoid false-positives.

FossilOrigin-Name: 4ec8a5a203f10d228d0b3389120638766cc343179dbe38d5dbf69b650765934c

manifest

@@ -1,5 +1,5 @@
-C Version\s3.32.1
-D 2020-05-25T16:19:56.155
+C Innocuous\schanges\sto\shelp\sCoverity\savoid\sfalse-positives.
+D 2020-05-26T10:54:46.900
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -485,7 +485,7 @@ F src/date.c b29b349d277e3d579dcc295b24c0a2caed83fd8f090a9f7cbe6070c0fd662384
 F src/dbpage.c 8a01e865bf8bc6d7b1844b4314443a6436c07c3efe1d488ed89e81719047833a
 F src/dbstat.c 793deaf88a0904f88285d93d6713c636d55ede0ffd9f08d10f4ea825531d367f
 F src/delete.c 88047c8e59878c920fce14582bc1dde4d81157d1ca5ffdf36c2907e6d41996c4
-F src/expr.c b46669d9fc9e0361dba6cc289901a013789e0b1dc629c4c1bc88ec9403633b38
+F src/expr.c 7a388ddfac396635f38630429a2777fa36e9c1604e48114cb53be7316487a868
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 4b575423b0a5d4898b1a7868ce985cf1a8ad91c741c9abbb108ff02536d20f41
 F src/func.c 2333eb4277f55a5efdc12ef754e7d7ec9105d257b2fd00301d23ce1e8fa67dc0
@@ -528,7 +528,7 @@ F src/pcache.h 4f87acd914cef5016fae3030343540d75f5b85a1877eed1a2a19b9f284248586
 F src/pcache1.c 6596e10baf3d8f84cc1585d226cf1ab26564a5f5caf85a15757a281ff977d51a
 F src/pragma.c 1b0db48177e52b256c003b8dc6ac708b1079a82cded944a23820574586a4731f
 F src/pragma.h 8168e588536bffd95319451f34e9a754dc37d205ebe433031a7813c5b286beae
-F src/prepare.c 8d4d6c8aa6afefc48027c54b41cdf134b4d6bc2fc4badbe483ad7fd9e1728a28
+F src/prepare.c aeb3ba661e2666dab15c4b5c55f6eb816f01d20e35fa860bb807e4a3b36e1e27
 F src/printf.c 94b5419ad0a17269f76a9e968ca19cf9fa37617abed2e246fc48844e511b6bc6
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c c2008519a0654f1e7490e9281ed0397d0f14bb840d81f0b96946248afcbdb25d
@@ -1866,10 +1866,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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-R 060d4022d9a6a2267bacd2bd89abcc90
-T +bgcolor * #d0c0ff
-T +sym-release *
-T +sym-version-3.32.1 *
+P 0c1fcf4711a2e66c813aed38cf41cd3e2123ee8eb6db98118086764c4ba83350
+R 85d34056e1232590b03a0479ee5fb897
 U drh
-Z 2dade396208e30c3681b79baa530525b
+Z 1828178303ff8f8ff8fc532baf643ec7

manifest.uuid

@@ -1 +1 @@
-0c1fcf4711a2e66c813aed38cf41cd3e2123ee8eb6db98118086764c4ba83350
+4ec8a5a203f10d228d0b3389120638766cc343179dbe38d5dbf69b650765934c

src/expr.c

@@ -2563,6 +2563,7 @@ int sqlite3FindInIndex(
 
     /* Code an OP_Transaction and OP_TableLock for <table>. */
     iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
+    assert( iDb>=0 && iDb<SQLITE_MAX_ATTACHED );
     sqlite3CodeVerifySchema(pParse, iDb);
     sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
 

src/prepare.c

@@ -504,17 +504,18 @@ static void schemaIsValid(Parse *pParse){
 ** attached database is returned.
 */
 int sqlite3SchemaToIndex(sqlite3 *db, Schema *pSchema){
-  int i = -1000000;
+  int i = -32768;
 
-  /* If pSchema is NULL, then return -1000000. This happens when code in 
+  /* If pSchema is NULL, then return -32768. This happens when code in 
   ** expr.c is trying to resolve a reference to a transient table (i.e. one
   ** created by a sub-select). In this case the return value of this 
   ** function should never be used.
   **
-  ** We return -1000000 instead of the more usual -1 simply because using
-  ** -1000000 as the incorrect index into db->aDb[] is much 
+  ** We return -32768 instead of the more usual -1 simply because using
+  ** -32768 as the incorrect index into db->aDb[] is much 
   ** more likely to cause a segfault than -1 (of course there are assert()
-  ** statements too, but it never hurts to play the odds).
+  ** statements too, but it never hurts to play the odds) and
+  ** -32768 will still fit into a 16-bit signed integer.
   */
   assert( sqlite3_mutex_held(db->mutex) );
   if( pSchema ){