drm/msm/adreno: Do not propagate void return values

With sparse ("make C=2"), lots of

  error: return expression in void function

messages are seen.

Fix this by removing the return statements to propagate void return
values.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Patchwork: https://patchwork.freedesktop.org/patch/492529/
Link: https://lore.kernel.org/r/0083bc7e23753c19902580b902582ae499b44dbf.1657113388.git.geert@linux-m68k.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/a6xx_gmu.c

@@ -505,7 +505,7 @@ static void a6xx_rpmh_stop(struct a6xx_gmu *gmu)
 
 static inline void pdc_write(void __iomem *ptr, u32 offset, u32 value)
 {
-	return msm_writel(value, ptr + (offset << 2));
+	msm_writel(value, ptr + (offset << 2));
 }
 
 static void __iomem *a6xx_gmu_get_mmio(struct platform_device *pdev,

drivers/gpu/drm/msm/adreno/a6xx_gmu.h

@@ -98,7 +98,7 @@ static inline u32 gmu_read(struct a6xx_gmu *gmu, u32 offset)
 
 static inline void gmu_write(struct a6xx_gmu *gmu, u32 offset, u32 value)
 {
-	return msm_writel(value, gmu->mmio + (offset << 2));
+	msm_writel(value, gmu->mmio + (offset << 2));
 }
 
 static inline void
@@ -138,7 +138,7 @@ static inline u32 gmu_read_rscc(struct a6xx_gmu *gmu, u32 offset)
 
 static inline void gmu_write_rscc(struct a6xx_gmu *gmu, u32 offset, u32 value)
 {
-	return msm_writel(value, gmu->rscc + (offset << 2));
+	msm_writel(value, gmu->rscc + (offset << 2));
 }
 
 #define gmu_poll_timeout_rscc(gmu, addr, val, cond, interval, timeout) \

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -1514,7 +1514,7 @@ static void a6xx_llc_rmw(struct a6xx_gpu *a6xx_gpu, u32 reg, u32 mask, u32 or)
 
 static void a6xx_llc_write(struct a6xx_gpu *a6xx_gpu, u32 reg, u32 value)
 {
-	return msm_writel(value, a6xx_gpu->llc_mmio + (reg << 2));
+	msm_writel(value, a6xx_gpu->llc_mmio + (reg << 2));
 }
 
 static void a6xx_llc_deactivate(struct a6xx_gpu *a6xx_gpu)