Fix PG_RETURN_JSONB() definition

Author: Nikita Glukhov

src/include/utils/jsonb.h

@@ -73,7 +73,7 @@ typedef enum
 #define JsonbPGetDatum(p)	PointerGetDatum(p)
 #define PG_GETARG_JSONB_P(x)	DatumGetJsonbP(PG_GETARG_DATUM(x))
 #define PG_GETARG_JSONB_P_COPY(x)	DatumGetJsonbPCopy(PG_GETARG_DATUM(x))
-#define PG_RETURN_JSONB_P(x)	PG_RETURN_POINTER(x)
+#define PG_RETURN_JSONB_P(x)	PG_RETURN_DATUM(JsonbPGetDatum(x))
 
 typedef struct JsonbPair JsonbPair;
 typedef struct JsonbValue JsonbValue;