updated for version 7.4a.018
Problem:    Compiler warning for code unreachable. (Charles Campbell)
Solution:   Use "while" instead of endless loop.  Change break to continue.
diff --git a/src/ui.c b/src/ui.c
index 577b742..18021c2 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -1467,8 +1467,9 @@
     else
 # endif
 	return clip_x11_owner_exists(cbd);
-#endif
+#else
     return TRUE;
+#endif
 }
 
 #endif /* FEAT_CLIPBOARD */