staging/easycap: fix mismatch in easycap_poll() mutex lock-unlock
In case if condition (kd != isdongle(peasycap)) becomes true, easycap_poll() returns without releasing easycapdc60_dongle[kd].mutex_video. The patch adds mutex_unlock() before that return. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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