base: genlock: Use a signed long for the result from wait_timeout
interruptible_wait_timeout returns a signed long, so make sure that
we use a signed long to hold the result. Using an unsigned value would
horribly misinterpet an error such as -ERESTARTSYS.
CRs-Fixed: 341347
Change-Id: Ic0dedbadff2dbe404e68a2a78f6282b5976d05c1
Signed-off-by:
Jordan Crouse <jcrouse@codeaurora.org>
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