Avoid leak in CompileKeymap error path

The NULL check is unneeded, and prevented the atoms from being free'd.

Signed-off-by: Ran Benita <ran234@gmail.com>

[daniels: Updated for xkb_map_unref.]

src/xkbcomp/keymap.c

@@ -198,8 +198,7 @@ CompileKeymap(struct xkb_context *context, XkbFile *file, unsigned merge)
 
 err:
     ACTION("Failed to compile keymap\n");
-    if (xkb)
-        xkb_map_unref(xkb);
+    xkb_map_unref(xkb);
     while (unbound) {
         next = (LEDInfo *) unbound->defs.next;
         free(unbound);