(trx0trx.c:1801) Bug#55227 Fix compiler warnings in innodb with gcc 4.6

storage/innobase/trx/trx0trx.c

@@ -1798,7 +1798,6 @@ trx_prepare_off_kernel(
 /*===================*/
 	trx_t*	trx)	/*!< in: transaction */
 {
-	page_t*		update_hdr_page;
 	trx_rseg_t*	rseg;
 	ib_uint64_t	lsn		= 0;
 	mtr_t		mtr;
@@ -1831,7 +1830,7 @@ trx_prepare_off_kernel(
 		}
 
 		if (trx->update_undo) {
-			update_hdr_page = trx_undo_set_state_at_prepare(
+			trx_undo_set_state_at_prepare(
 				trx, trx->update_undo, &mtr);
 		}