Minor cleanup: unify two codepaths that do the same thing.
diff --git a/toys/posix/wc.c b/toys/posix/wc.c
index a9c588e..56c9673 100644
--- a/toys/posix/wc.c
+++ b/toys/posix/wc.c
@@ -63,10 +63,8 @@
       if (CFG_TOYBOX_I18N && (toys.optflags&FLAG_m)) {
         clen = mbrtowc(&wchar, toybuf+i, len-i, 0);
         if (clen == -1) {
-          if (i != len-1) {
-            clen = 1;
-            continue;
-          } else break;
+          clen = 1;
+          continue;
         }
         if (clen == -2) break;
         if (clen == 0) clen=1;