qemu-img: fix formatting of error message
The error_reportf_err() will not automatically append a ': ' before adding its suffix, so we must include that in the message we pass it, otherwise we get a badly formatted message lacking whitespace: qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=6666,tls-creds=tls0'Failed to connect socket: Connection refused Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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			@ -256,7 +256,7 @@ static BlockBackend *img_open_opts(const char *optstr,
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    options = qemu_opts_to_qdict(opts, NULL);
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    blk = blk_new_open(NULL, NULL, options, flags, &local_err);
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    if (!blk) {
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        error_reportf_err(local_err, "Could not open '%s'", optstr);
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        error_reportf_err(local_err, "Could not open '%s': ", optstr);
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        return NULL;
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    }
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    blk_set_enable_write_cache(blk, !writethrough);
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