frv: fix check on unsigned in do_signal()

syscallno is unsigned
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/frv/kernel/signal.c

@@ -527,7 +527,7 @@ static void do_signal(void)
 
 no_signal:
 	/* Did we come from a system call? */
-	if (__frame->syscallno >= 0) {
+	if (__frame->syscallno != -1) {
 		/* Restart the system call - no handlers present */
 		switch (__frame->gr8) {
 		case -ERESTARTNOHAND: