rename field "raw" to "_raw" in struct pathspec

This patch is essentially no-op. It helps catching new use of this
field though. This field is introduced as an intermediate step for the
pathspec conversion and will be removed eventually. At this stage no
more access sites should be introduced.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/ls-tree.c

@@ -36,7 +36,7 @@ static int show_recursive(const char *base, int baselen, const char *pathname)
 	if (ls_options & LS_RECURSIVE)
 		return 1;
 
-	s = pathspec.raw;
+	s = pathspec._raw;
 	if (!s)
 		return 0;