qemu-io: Remove duplicate 'open' error message

qemu_opts_parse_noisily() already prints an error message with the exact
reason why the parsing failed. No need to add another less specific one.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

qemu-io.c

@@ -156,7 +156,6 @@ static int open_f(BlockBackend *blk, int argc, char **argv)
             break;
         case 'o':
             if (!qemu_opts_parse_noisily(&empty_opts, optarg, false)) {
-                printf("could not parse option list -- %s\n", optarg);
                 qemu_opts_reset(&empty_opts);
                 return 0;
             }