drm/msm: Fix error return checking

The error checks on ret for a negative error return always fails because
the return value of iommu_map_sg() is unsigned and can never be negative.

Detected with Coccinelle:
drivers/gpu/drm/msm/msm_iommu.c:69:9-12: WARNING: Unsigned expression
compared with zero: ret < 0

Signed-off-by: Wen Yang <[email protected]>
CC: Rob Clark <[email protected]>
CC: David Airlie <[email protected]>
CC: Julia Lawall <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
Signed-off-by: Sean Paul <[email protected]>

0 files changed, 0 insertions, 0 deletions