Allow sqlite3_interrupt() to be invoked on a database connection that is in

the process of being closed even if SQLITE_ENABLE_API_ARMOR is defined.

FossilOrigin-Name: 7854bee260996087bdb7f8729ba8cfb4f467f93f

manifest

@@ -1,5 +1,5 @@
-C Adjust\sa\scorruption\stest\scase\sto\saccommodate\sthe\ssqlite3BtreeInsert()\noptimization\sof\scheck-in\s[0b86fbca66].
-D 2016-12-27T12:45:41.649
+C Allow\ssqlite3_interrupt()\sto\sbe\sinvoked\son\sa\sdatabase\sconnection\sthat\sis\sin\nthe\sprocess\sof\sbeing\sclosed\seven\sif\sSQLITE_ENABLE_API_ARMOR\sis\sdefined.
+D 2016-12-27T13:33:52.277
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 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@ -353,7 +353,7 @@ F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c 91ba5d0143e66479081536ebbaff1850ec9f57d9
 F src/legacy.c 75d3023be8f0d2b99d60f905090341a03358c58e
 F src/loadext.c 5d6642d141c07d366e43d359e94ec9de47add41d
-F src/main.c ec789a410860bcdc5d8f7a82090043f482482aec
+F src/main.c f2d0e34457ba8c5cce6d78a32cacab388d33e967
 F src/malloc.c f3fad34cd570022abca558c573f1761fb09a8212
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c 6919bcf12f221868ea066eec27e579fed95ce98b
@@ -1539,7 +1539,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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manifest.uuid

@@ -1 +1 @@
-4cb0945f13f2040c8b67936b950da48fc951d55d
+7854bee260996087bdb7f8729ba8cfb4f467f93f

src/main.c

@@ -1568,7 +1568,7 @@ int sqlite3_busy_timeout(sqlite3 *db, int ms){
 */
 void sqlite3_interrupt(sqlite3 *db){
 #ifdef SQLITE_ENABLE_API_ARMOR
-  if( !sqlite3SafetyCheckOk(db) ){
+  if( !sqlite3SafetyCheckOk(db) && (db==0 || db->magic!=SQLITE_MAGIC_ZOMBIE) ){
     (void)SQLITE_MISUSE_BKPT;
     return;
   }