qemu-img: show help for invalid global options

The qemu-img sub-command executes regardless of invalid global options:

  $ qemu-img --foo info test.img
  qemu-img: unrecognized option '--foo'
  image: test.img
  ...

The unrecognized option warning may be missed by the user.  This can
hide incorrect command-lines in scripts and confuse users.

This patch prints the help information and terminates instead of
executing the sub-command.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170317104541.28979-2-stefanha@redhat.com
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NMax Reitz <mreitz@redhat.com>

qemu-img.c

@@ -4339,6 +4339,7 @@ int main(int argc, char **argv)
     while ((c = getopt_long(argc, argv, "+hVT:", long_options, NULL)) != -1) {
         switch (c) {
         case 'h':
+        case '?':
             help();
             return 0;
         case 'V':