Fix unnecessary printout of same writer thread more than once. Fixed

also a compiler warning.

storage/innobase/handler/ha_innodb.cc

@@ -17341,7 +17341,7 @@ ib_senderrf(
 
 	va_start(args, code);
 
-	myf	l;
+	myf	l=0;
 
 	switch(level) {
 	case IB_LOG_LEVEL_INFO:

storage/innobase/sync/sync0arr.cc

@@ -966,7 +966,7 @@ sync_array_print_long_waits_low(
 	if (*noticed) {
 		for (i = 0; i < arr->n_cells; i++) {
 			void*	wait_object;
-			os_thread_id_t reserver=0;
+			os_thread_id_t reserver=ULINT_UNDEFINED;
 			sync_cell_t*	cell;
 			ulint loop = 0;
 
@@ -984,7 +984,7 @@ sync_array_print_long_waits_low(
 			sync_array_cell_print(stderr, cell, &reserver);
 
 			/* Try to output cell information for writer recursive way */
-			while (reserver != 0) {
+			while (reserver != ULINT_UNDEFINED) {
 				sync_cell_t* reserver_wait;
 
 				reserver_wait = sync_array_find_thread(arr, reserver);
@@ -994,16 +994,22 @@ sync_array_print_long_waits_low(
 					reserver_wait->waiting) {
 					fputs("InnoDB: Warning: Writer thread is waiting this semaphore:\n",
 						stderr);
+					reserver = ULINT_UNDEFINED;
 					sync_array_cell_print(stderr, reserver_wait, &reserver);
+					loop++;
+
+					if (reserver_wait->thread == reserver) {
+						reserver = ULINT_UNDEFINED;
+					}
 				} else {
-					reserver = 0;
+					reserver = ULINT_UNDEFINED;
 				}
-
 				/* This is protection against loop */
 				if (loop > 100) {
 					fputs("InnoDB: Warning: Too many waiting threads.\n", stderr);
 					break;
 				}
+
 			}
 		}
 	}

storage/xtradb/sync/sync0arr.cc

@@ -1062,7 +1062,7 @@ sync_array_print_long_waits_low(
 		for (i = 0; i < arr->n_cells; i++) {
 			void*	wait_object;
 			sync_cell_t*	cell;
-			os_thread_id_t reserver=0;
+			os_thread_id_t reserver=ULINT_UNDEFINED;
 			ulint loop=0;
 
 			cell = sync_array_get_nth_cell(arr, i);
@@ -1090,7 +1090,6 @@ sync_array_print_long_waits_low(
 					fputs("InnoDB: Warning: Writer thread is waiting this semaphore:\n",
 						stderr);
 					sync_array_cell_print(stderr, reserver_wait, &reserver);
-					loop++;
 				} else {
 					reserver = 0;
 				}