Inspect: fix extension extraction when different extensions are given

When a exu and a rec file were given, the ext was remaining exu and a
crash was happening.

src/bin/inspect.c

@@ -1201,7 +1201,7 @@ main(int argc, char *argv[])
         if (output) gui_needed = EINA_FALSE;
         for (arg = args; arg < argc; arg++)
           {
-             if (!ext) ext = strrchr(argv[arg], '.');
+             ext = strrchr(argv[arg], '.');
              if (!ext)
                {
                   fprintf(stderr, "Extension required\n");