sparse fix: non-ANSI function declaration

The declaration of discard_cache() in cache.h already has its "void".

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

index-pack.c

@@ -90,7 +90,7 @@ static SHA_CTX input_ctx;
 static int input_fd, output_fd, mmap_fd;
 
 /* Discard current buffer used content. */
-static void flush()
+static void flush(void)
 {
 	if (input_offset) {
 		if (output_fd >= 0)

read-cache.c

@@ -844,7 +844,7 @@ unmap:
 	die("index file corrupt");
 }
 
-int discard_cache()
+int discard_cache(void)
 {
 	int ret;