drm/amd/display: cleanup inconsistent indenting in amdgpu_dm_color

smatch warnings:
amdgpu_dm_update_plane_color_mgmt() warn: inconsistent indenting
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401051643.PPdbmG1U-lkp@intel.com/Signed-off-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c

@@ -1239,7 +1239,7 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
 	if (has_crtc_cm_degamma && ret != -EINVAL) {
 		drm_dbg_kms(crtc->base.crtc->dev,
 			    "doesn't support plane and CRTC degamma at the same time\n");
-			return -EINVAL;
+		return -EINVAL;
 	}
 
 	/* If we are here, it means we don't have plane degamma settings, check