qemu-io: Make filename optional
Giving a filename is actually not essential, since it can be specified through the options as well - on the contrary: Sometimes a filename must not be given. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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		@@ -163,11 +163,13 @@ static int open_f(BlockDriverState *bs, int argc, char **argv)
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        flags |= BDRV_O_RDWR;
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					        flags |= BDRV_O_RDWR;
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    }
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					    }
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    if (optind != argc - 1) {
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					    if (optind == argc - 1) {
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					        return openfile(argv[optind], flags, growable, opts);
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					    } else if (optind == argc) {
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					        return openfile(NULL, flags, growable, opts);
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					    } else {
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        return qemuio_command_usage(&open_cmd);
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					        return qemuio_command_usage(&open_cmd);
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    }
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					    }
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    return openfile(argv[optind], flags, growable, opts);
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}
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					}
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static int quit_f(BlockDriverState *bs, int argc, char **argv)
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					static int quit_f(BlockDriverState *bs, int argc, char **argv)
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