'simple' error message functions by Loic Grenie <loic.grenie@gmail.com>.
263 bytes saved.

diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index 73fe105..db43aa5 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -31,7 +31,7 @@
 		status = swapoff(device);
 
 	if (status != 0) {
-		bb_perror_msg("%s", device);
+		bb_simple_perror_msg(device);
 		return 1;
 	}