refspec: trivial cleanup

We can remove one level of indentation and make the code clearer.

No functional changes.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

refspec.c

@@ -272,15 +272,16 @@ void refspec_ref_prefixes(const struct refspec *rs,
 		else if (item->src && !item->exact_sha1)
 			prefix = item->src;
 
-		if (prefix) {
-			if (item->pattern) {
-				const char *glob = strchr(prefix, '*');
-				strvec_pushf(ref_prefixes, "%.*s",
-					     (int)(glob - prefix),
-					     prefix);
-			} else {
-				expand_ref_prefix(ref_prefixes, prefix);
-			}
+		if (!prefix)
+			continue;
+
+		if (item->pattern) {
+			const char *glob = strchr(prefix, '*');
+			strvec_pushf(ref_prefixes, "%.*s",
+				     (int)(glob - prefix),
+				     prefix);
+		} else {
+			expand_ref_prefix(ref_prefixes, prefix);
 		}
 	}
 }