[PGPRO-8962] Fix compilation errors via clang-15.

1) remove unused variable
2) suppress error about unused yynerr (bison variable)

Tags: jsquery.

Author: Ekaterina Sokolova

Diff for: jsonb_gin_ops.c

@@ -173,7 +173,6 @@ get_bloom_value(uint32 hash)
 static uint32
 get_path_bloom(PathHashStack *stack)
 {
-	int	i = 0;
 	uint32 res = 0, val;
 
 	while (stack)
@@ -183,7 +182,6 @@ get_path_bloom(PathHashStack *stack)
 		val = get_bloom_value(hash);
 
 		res |= val;
-		i++;
 		stack = stack->parent;
 	}
 	return res;

Diff for: jsquery_gram.y

@@ -254,7 +254,10 @@ makeItemList(List *list) {
 %%
 
 result:
-	expr							{ *result = $1; }
+	expr							{
+										*result = $1;
+										(void) yynerrs;		/* suppress compiler warning */
+									}
 	| /* EMPTY */					{ *result = NULL; }
 	;