Fix unsigned output format in SLRU error reporting

Avoid printing signed values as unsigned.  (No impact in practice
expected.)

Author: Pavel Borisov <pashkin.elfe@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CALT9ZEHN7hWJo6MgJKqoDMGj%3DGOzQU50wTvOYZXDj7x%3DsUK-kw%40mail.gmail.com

Author: petere

src/backend/access/transam/slru.c

@@ -949,32 +949,32 @@ SlruReportIOError(SlruCtl ctl, int pageno, TransactionId xid)
 			ereport(ERROR,
 					(errcode_for_file_access(),
 					 errmsg("could not access status of transaction %u", xid),
-					 errdetail("Could not seek in file \"%s\" to offset %u: %m.",
+					 errdetail("Could not seek in file \"%s\" to offset %d: %m.",
 							   path, offset)));
 			break;
 		case SLRU_READ_FAILED:
 			if (errno)
 				ereport(ERROR,
 						(errcode_for_file_access(),
 						 errmsg("could not access status of transaction %u", xid),
-						 errdetail("Could not read from file \"%s\" at offset %u: %m.",
+						 errdetail("Could not read from file \"%s\" at offset %d: %m.",
 								   path, offset)));
 			else
 				ereport(ERROR,
 						(errmsg("could not access status of transaction %u", xid),
-						 errdetail("Could not read from file \"%s\" at offset %u: read too few bytes.", path, offset)));
+						 errdetail("Could not read from file \"%s\" at offset %d: read too few bytes.", path, offset)));
 			break;
 		case SLRU_WRITE_FAILED:
 			if (errno)
 				ereport(ERROR,
 						(errcode_for_file_access(),
 						 errmsg("could not access status of transaction %u", xid),
-						 errdetail("Could not write to file \"%s\" at offset %u: %m.",
+						 errdetail("Could not write to file \"%s\" at offset %d: %m.",
 								   path, offset)));
 			else
 				ereport(ERROR,
 						(errmsg("could not access status of transaction %u", xid),
-						 errdetail("Could not write to file \"%s\" at offset %u: wrote too few bytes.",
+						 errdetail("Could not write to file \"%s\" at offset %d: wrote too few bytes.",
 								   path, offset)));
 			break;
 		case SLRU_FSYNC_FAILED: