drm/amd/powerplay: fix no statements in function returning non-void

Add missing return (rebase fix).
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/navi10_ppt.c

@@ -494,6 +494,8 @@ static int navi10_tables_init(struct smu_context *smu, struct smu_table *tables)
 	SMU_TABLE_INIT(tables, SMU_TABLE_ACTIVITY_MONITOR_COEFF,
 		       sizeof(DpmActivityMonitorCoeffInt_t), PAGE_SIZE,
 		       AMDGPU_GEM_DOMAIN_VRAM);
+
+	return 0;
 }
 
 static int navi10_allocate_dpm_context(struct smu_context *smu)