[sqlite] Check in 3056

[Miguel Angel Latorre Díaz]

I think there is a logic error in check in  3056:

void *sqlite3Realloc(void *p, int n){
 void *np = 0;
 if( !sqlite3MallocFailed() ){
#ifndef SQLITE_ENABLE_MEMORY_MANAGEMENT
   int oldsize = OSSIZEOF(p);
#endif
   while( (np = OSREALLOC(p, n))==0 && sqlite3_release_memory(n) );
   if( !np || handleSoftLimit(OSSIZEOF(np) - oldsize) ){
     OSFREE(np);
     sqlite3FailedMalloc();
     OSMALLOC_FAILED();
   }
 }
 return np;
}
Variable oldsize in line 595 is not initialized if macro 
SQLITE_ENABLE_MEMORY_MANAGEMENT is set.