Keep static analyzers happy

Make it clear fall through is intentional.

Signed-off-by: Simo Sorce <simo@redhat.com>
diff --git a/skeletons/INTEGER.c b/skeletons/INTEGER.c
index 8ead23d..d805c56 100644
--- a/skeletons/INTEGER.c
+++ b/skeletons/INTEGER.c
@@ -976,6 +976,7 @@
 	case '-':
 		last_digit_max++;
 		sign = -1;
+		/* FALL THROUGH */
 	case '+':
 		str++;
 		if(str >= *end) {