amd/display/dc: remove repeating expression

Identify issues that arise by using the tests/doubletest.cocci
semantic patch. Need to remove duplicate expression in if statement.
Signed-off-by: Wang Ming <machel@vivo.com>
Reviewed-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c

@@ -1610,7 +1610,7 @@ static int source_format_to_bpp (enum source_format_class SourcePixelFormat)
 {
 	if (SourcePixelFormat == dm_444_64)
 		return 8;
-	else if (SourcePixelFormat == dm_444_16 || SourcePixelFormat == dm_444_16)
+	else if (SourcePixelFormat == dm_444_16)
 		return 2;
 	else if (SourcePixelFormat == dm_444_8)
 		return 1;