msm: kgsl: Do not return error if there is no GMU

If there is no GMU but oob_set is called, return 0
instead of returning error. This simplifies the code.

CRs-Fixed: 2017390
Change-Id: I52bdb82d4cc6972277ddfde061a79262a56e731e
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
diff --git a/drivers/gpu/msm/adreno_a6xx.c b/drivers/gpu/msm/adreno_a6xx.c
index 472b6fc..98ca77f 100644
--- a/drivers/gpu/msm/adreno_a6xx.c
+++ b/drivers/gpu/msm/adreno_a6xx.c
@@ -948,7 +948,7 @@
 	int ret = 0;
 
 	if (!kgsl_gmu_isenabled(device))
-		return -ENODEV;
+		return 0;
 
 	kgsl_gmu_regwrite(device, A6XX_GMU_HOST2GMU_INTR_SET, set_mask);