staging: media: Remove redundant memset.

The memory area set by the call to memset is immediately
overwritten by the subsequent call to memcpy. Hence, remove that
redundant memset.

Signed-off-by: Navya Sri Nizamkari <navyasri.tech@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>