Add missing break in switch.

Coverity CID 1473475.
diff --git a/src/zipcmp.c b/src/zipcmp.c
index 2edfc83..66e4b24 100644
--- a/src/zipcmp.c
+++ b/src/zipcmp.c
@@ -152,6 +152,7 @@
         switch (c) {
             case 'C':
                 check_consistency = 1;
+                break;
             case 'i':
                 ignore_case = 1;
                 break;