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

diff --git a/miscutils/mountpoint.c b/miscutils/mountpoint.c
index 0f1e155..376bd95 100644
--- a/miscutils/mountpoint.c
+++ b/miscutils/mountpoint.c
@@ -61,6 +61,6 @@
 		}
 	}
 	if (!(opt & OPT_q))
-		bb_perror_msg("%s", arg);
+		bb_simple_perror_msg(arg);
 	return EXIT_FAILURE;
 }