xfsprogs: fix warning in libxcmd/input.c

[Ben Myers]

Fix an error when building with -Werror=format-security.

input.c: In function 'fetchline':
input.c:91:2: error: format not a string literal and no format arguments [-Werror=format-security]

Signed-off-by: Ben Myers <bpm at sgi.com>
Reported by: Arkadiusz Miśkiewicz <arekm at maven.pl>
Index: xfsprogs/libxcmd/input.c
===================================================================
--- xfsprogs.orig/libxcmd/input.c	2013-02-01 15:29:47.069894522 -0600
+++ xfsprogs/libxcmd/input.c	2013-02-01 15:30:00.845895188 -0600
@@ -88,7 +88,7 @@
 
 	if (!line)
 		return NULL;
-	printf(get_prompt());
+	printf("%s", get_prompt());
 	fflush(stdout);
 	if (!fgets(line, MAXREADLINESZ, stdin)) {
 		free(line);