qconfig: Move checking directory to the top

Move this check to the top, so it happens always. The tool should be
run from the U-Boot source directory.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/qconfig.py

@@ -1528,6 +1528,9 @@ def main():
                 args.scan_source, args.test)):
         parser.print_usage()
         sys.exit(1)
+
+    check_top_directory()
+
     if args.test:
         sys.argv = [sys.argv[0]]
         fail, _ = doctest.testmod()
@@ -1542,8 +1545,6 @@ def main():
     # prefix the option name with CONFIG_ if missing
     configs = [prefix_config(cfg) for cfg in args.configs]
 
-    check_top_directory()
-
     if args.imply:
         imply_flags = 0
         if args.imply_flags == 'all':