drm/amd/display: Clean up errors in color_gamma.c

Fix the following errors reported by checkpatch:

ERROR: trailing whitespace
ERROR: else should follow close brace '}'
Signed-off-by: Ran Sun <sunran001@208suo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

@@ -379,8 +379,7 @@ static struct fixed31_32 translate_from_linear_space(
 		scratch_1 = dc_fixpt_sub(scratch_1, args->a2);
 
 		return scratch_1;
-	}
-	else
+	} else
 		return dc_fixpt_mul(args->arg, args->a1);
 }