libpam: mark _pam_output_debug as printf-style function

Marking _pam_output_debug as printf-style function allows the compiler to
check for potential errors at places where this function is called, like
mismatches in the argument types or insufficient number of arguments.

Signed-off-by: Benny Baumann <BenBE@geshi.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/libpam/include/security/_pam_macros.h b/libpam/include/security/_pam_macros.h
index 0d6646cf..b6a5c2e4 100644
--- a/libpam/include/security/_pam_macros.h
+++ b/libpam/include/security/_pam_macros.h
@@ -123,6 +123,7 @@ static void _pam_output_debug_info(const char *file, const char *fn
         fclose(logfile);
 }
 
+PAM_FORMAT((printf, 1, 2))
 static void _pam_output_debug(const char *format, ...)
 {
     va_list args;