Fix various harmless compiler warnings.

FossilOrigin-Name: 70049342d5ad57ea3e863bba19253934b868bacdd1c26c9371bac024a829badf

src/expr.c

@@ -3497,7 +3497,6 @@ static void sqlite3ExprCodeIN(
   }else{
     destStep2 = destStep6 = sqlite3VdbeMakeLabel(pParse);
   }
-//  if( pParse->nErr ) goto sqlite3ExprCodeIN_finished;
   for(i=0; i<nVector; i++){
     Expr *p = sqlite3VectorFieldSubexpr(pExpr->pLeft, i);
     if( pParse->nErr ) goto sqlite3ExprCodeIN_oom_error;

src/func.c

@@ -106,6 +106,7 @@ static void subtypeFunc(
   int argc,
   sqlite3_value **argv
 ){
+  UNUSED_PARAMETER(argc);
   sqlite3_result_int(context, sqlite3_value_subtype(argv[0]));
 }
 

src/json.c

@@ -2666,7 +2666,7 @@ int sqlite3JsonTableFunctions(sqlite3 *db){
     { "json_each",            &jsonEachModule               },
     { "json_tree",            &jsonTreeModule               },
   };
-  int i;
+  unsigned int i;
   for(i=0; i<sizeof(aMod)/sizeof(aMod[0]) && rc==SQLITE_OK; i++){
     rc = sqlite3_create_module(db, aMod[i].zName, aMod[i].pModule, 0);
   }

src/whereInt.h

@@ -123,8 +123,8 @@ struct WhereLoop {
     } btree;
     struct {               /* Information for virtual tables */
       int idxNum;            /* Index number */
-      u8 needFree : 1;       /* True if sqlite3_free(idxStr) is needed */
-      u8 bOmitOffset : 1;    /* True to let virtual table handle offset */
+      u32 needFree : 1;      /* True if sqlite3_free(idxStr) is needed */
+      u32 bOmitOffset : 1;   /* True to let virtual table handle offset */
       i8 isOrdered;          /* True if satisfies ORDER BY */
       u16 omitMask;          /* Terms that may be omitted */
       char *idxStr;          /* Index identifier string */