UPSTREAM: kcov: fix comparison callback signature

UPSTREAM: kcov: fix comparison callback signature

Fix a silly copy-paste bug.  We truncated u32 args to u16.

Link: http://lkml.kernel.org/r/20171207101134.107168-1-dvyukov@google.com
Fixes: ded97d2c2b2c ("kcov: support comparison operands collection")
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: syzkaller@googlegroups.com
Cc: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Bug: 64145065
(cherry-picked from 8c0431ec452de79ef3fe998c1fbb1e3d3ac13ddd)
Change-Id: Ic3872c33d03a456640dd6fdcce3b0795765dc1c0
Signed-off-by: Paul Lawrence <paullawrence@google.com>