Mark FatalError() as taking printf-style arguments

Silences -Wformat-nonliteral warnings about passing through
unknown format arguments to vfprintf.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/dsimple.h b/dsimple.h
index ae77a30..eb77c7e 100644
--- a/dsimple.h
+++ b/dsimple.h
@@ -80,4 +80,4 @@ void usage(void);
 Window Select_Window(Display *, int descend);
 Window Window_With_Name(Display *, Window, const char *);
 
-void Fatal_Error(char *, ...) _X_NORETURN;
+void Fatal_Error(char *, ...) _X_NORETURN _X_ATTRIBUTE_PRINTF(1,2);