do not rely on obsolete feature

function prototype with unspecified argument is obsolete since c99.

additionally some of these function which don't take any argument were
being called with a `const char *` arg, which is UB.

fix both these issues by declararing ALL the components to accept a
`const char *`, and name the arg "unused" if it's meant to be ignored.

1 files changed, 1 insertions, 1 deletions

diff --git a/slstatus.c b/slstatus.c
index 64da5cb..8fe5b44 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -12,7 +12,7 @@
 #include "util.h"
 
 struct arg {
-	const char *(*func)();
+	const char *(*func)(const char *);
 	const char *fmt;
 	const char *args;
 };