mei: fix fasync return value on error
fasync should return a negative value on error and not poll mask POLLERR. Cc: <stable@vger.kernel.org> # 4.3+ Cc: Al Viro <viro@ZenIV.linux.org.uk> Reported-by: NAl Viro <viro@ZenIV.linux.org.uk> Signed-off-by: NTomas Winkler <tomas.winkler@intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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