fsx: fix compiler warning due to bad prototype

I see the following with gcc 4.8.5 [-Wunprototyped-calls]:
	warning: call to function 'cleanup' without a real prototype

Fix this by moving the function definition up, and dropping the
prototype.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <eguan@redhat.com>

ltp/fsx.c

@@ -1272,7 +1272,14 @@ do {						\
 	TRIM_LEN(off, len, size);		\
 } while (0)
 
-void cleanup();
+void
+cleanup(int sig)
+{
+	if (sig)
+		prt("signal %d\n", sig);
+	prt("testcalls = %lu\n", testcalls);
+	exit(sig);
+}
 
 static int
 read_op(struct log_entry *log_entry)
@@ -1531,17 +1538,6 @@ out:
 }
 
 
-void
-cleanup(sig)
-	int	sig;
-{
-	if (sig)
-		prt("signal %d\n", sig);
-	prt("testcalls = %lu\n", testcalls);
-	exit(sig);
-}
-
-
 void
 usage(void)
 {