Fix an assert() in sqlite3VarintLen(), even though it is impossible to hit

in SQLite due to the way sqlite3VarintLen() is used.

FossilOrigin-Name: 251424c5869f43012fc1e1a545de362036b883db

manifest

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-D 2016-03-04T14:43:44.681
+C Fix\san\sassert()\sin\ssqlite3VarintLen(),\seven\sthough\sit\sis\simpossible\sto\shit\nin\sSQLite\sdue\sto\sthe\sway\ssqlite3VarintLen()\sis\sused.
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src/util.c

@@ -1093,7 +1093,7 @@ u8 sqlite3GetVarint32(const unsigned char *p, u32 *v){
 */
 int sqlite3VarintLen(u64 v){
   int i;
-  for(i=1; (v >>= 7)!=0; i++){ assert( i<9 ); }
+  for(i=1; (v >>= 7)!=0; i++){ assert( i<10 ); }
   return i;
 }