yam: integer underflow in yam_ioctl()
We cap bitrate at YAM_MAXBITRATE in yam_ioctl(), but it could also be negative. I don't know the impact of using a negative bitrate but let's prevent it. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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