Add NEVER to two unreachable branches in JSON.

FossilOrigin-Name: c96ebb086feb89341565cc52b970ae7799ce1327fe1ad4fc790f1b0dcaa6e229

manifest

@@ -1,5 +1,5 @@
-C Improvements\sto\sJSONB\svalidation\s-\scatch\smore\scases\swhere\sthe\sinput\sdoes\nnot\sconform\sto\sspec.
-D 2023-12-12T14:33:52.419
+C Add\sNEVER\sto\stwo\sunreachable\sbranches\sin\sJSON.
+D 2023-12-12T17:13:10.122
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -696,7 +696,7 @@ F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
 F src/hwtime.h f9c2dfb84dce7acf95ce6d289e46f5f9d3d1afd328e53da8f8e9008e3b3caae6
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c 3f0a94082d978bbdd33c38fefea15346c6c6bffb70bc645a71dc0f1f87dd3276
-F src/json.c 6fc223a6cf1f475dfe72376018615ed85a1415b57121571ad65747f8b845b57f
+F src/json.c cd270629b4b99d065522b45c3d2b5185491b1ab3544843c6f780aa50755d54dc
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 7432c944ff197046d67a1207790a1b13eec4548c85a9457eb0896bb3641dfb36
 F src/main.c ce714ee501122c76eb2e69b292bebe443aba611fc3b88e6786eb910285515fe4
@@ -2153,8 +2153,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P fa5160687c2f970d407e8af73c246f7cd806bb4ce35f29a79ac534a8646a6c8e
-R 06eab0897027e01e7643ca8237160284
+P be1864eac4eb75cc30bf98f73092c8608467f4bd956240df6a0cbea9f1e09e85
+R 6e221a94cd5525fe9f8a7e94ea467b60
 U drh
-Z fe2966c205a693292efc9fe6aaf9e427
+Z 2ea9e875faf360824d045f495f8867aa
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-be1864eac4eb75cc30bf98f73092c8608467f4bd956240df6a0cbea9f1e09e85
+c96ebb086feb89341565cc52b970ae7799ce1327fe1ad4fc790f1b0dcaa6e229

src/json.c

@@ -1255,8 +1255,8 @@ static u32 jsonbValidityCheck(
   if( iDepth>JSON_MAX_DEPTH ) return i+1;
   sz = 0;
   n = jsonbPayloadSize(pParse, i, &sz);
-  if( n==0 ) return i+1;
-  if( i+n+sz!=iEnd ) return i+1;
+  if( NEVER(n==0) ) return i+1;          /* Checked by caller */
+  if( NEVER(i+n+sz!=iEnd) ) return i+1;  /* Checked by caller */
   z = pParse->aBlob;
   x = z[i] & 0x0f;
   switch( x ){