[V2] drm: msm: adreno: use IS_ERR() instead of null pointer check

[Wang Qing]

a6xx_gmu_get_mmio() never return null in case of error, but ERR_PTR(), so 
we should use IS_ERR() instead of null pointer check and IS_ERR_OR_NULL().

Signed-off-by: Wang Qing <wangq...@vivo.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c 
b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 491fee4..82420f7
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -492,7 +492,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
        void __iomem *seqptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc_seq");
        uint32_t pdc_address_offset;
 
-       if (!pdcptr || !seqptr)
+       if (IS_ERR(pdcptr) || IS_ERR(seqptr))
                goto err;
 
        if (adreno_is_a618(adreno_gpu) || adreno_is_a640(adreno_gpu))
@@ -580,9 +580,9 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
        wmb();
 
 err:
-       if (!IS_ERR_OR_NULL(pdcptr))
+       if (!IS_ERR(pdcptr))
                iounmap(pdcptr);
-       if (!IS_ERR_OR_NULL(seqptr))
+       if (!IS_ERR(seqptr))
                iounmap(seqptr);
 }
 
-- 
2.7.4