error(): Type-check args against format string

Silences:

	src/main.c: In function ‘error’:
	src/main.c:49:2: warning: function might be possible candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
	  vfprintf(stderr, format, ap);
	  ^~~~~~~~

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index adbd81b..9bee050 100644
--- a/src/main.c
+++ b/src/main.c
@@ -37,7 +37,7 @@ set_program_name(const char *name)
 	program_name = name;
 }
 
-static void
+static void __attribute__((format(printf, 1, 2)))
 error(const char *format, ...)
 {
 	va_list ap;