msm: camera: Fix for dual ISP buffer management
Return -1 when there is no free buffer for dual ISP use case,
in order to have proper error handling in isp driver..
Change-Id: Ic3f3261bebe192fdcf62a1d06f4e8a1e6033ef61
Signed-off-by:
Kevin Chan <ktchan@codeaurora.org>
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