send-email: don't call methods on undefined values

diff --git a/advice.h b/advice.h
index 93a7d110ea94b055476644fd5ecbec43bb0aaf92..08fbc8ee3ce79f265bbe15b63e2ae561ee8a0857 100644 (file)
--- a/advice.h
+++ b/advice.h
@@ -21,6 +21,7 @@ extern int advice_object_name_warning;
 extern int advice_rm_hints;
 
 int git_default_advice_config(const char *var, const char *value);
+__attribute__((format (printf, 1, 2)))
 void advise(const char *advice, ...);
 int error_resolve_conflict(const char *me);
 extern void NORETURN die_resolve_conflict(const char *me);