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avicap32: Fail gracefully if V4L is unavailable.
Signed-off-by: Brendan Shanks <bshanks@codeweavers.com>
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@ -125,7 +125,7 @@ BOOL VFWAPI capGetDriverDescriptionW(WORD index, WCHAR *name, int name_len, WCHA
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struct get_device_desc_params params;
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params.index = index;
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if (__wine_unix_call(unix_handle, unix_get_device_desc, ¶ms))
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if (!unix_handle || __wine_unix_call(unix_handle, unix_get_device_desc, ¶ms))
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return FALSE;
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TRACE("Found device name %s, version %s.\n", debugstr_w(params.name), debugstr_w(params.version));
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