drivers: staging: Drop unlikely before IS_ERR(_OR_NULL)

IS_ERR(_OR_NULL) already contain an 'unlikely' compiler flag and there
is no need to do that again from its callers. Drop it.

This also replaces an IS_ERR(x) + (x == NULL) check to IS_ERR_OR_NULL
check.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/android/ashmem.c
Simple merge

diff --cc drivers/staging/lustre/include/linux/libcfs/libcfs.h
Simple merge

diff --cc drivers/staging/lustre/lustre/obdclass/lu_object.c
Simple merge