aio: Fix reference to outdated name

Reported-by: Antonin Houska <[email protected]>
Author: Antonin Houska <[email protected]>
Discussion: https://postgr.es/m/5250.1751266701@localhost
Backpatch-through: 18, where da72269 introduced this

Author: anarazel

src/include/storage/aio_types.h

@@ -107,7 +107,7 @@ typedef struct PgAioResult
 	/* of type PgAioResultStatus, see above */
 	uint32		status:PGAIO_RESULT_STATUS_BITS;
 
-	/* meaning defined by callback->error */
+	/* meaning defined by callback->report */
 	uint32		error_data:PGAIO_RESULT_ERROR_BITS;
 
 	int32		result;