trivial fix in setfiles. spotted by Yuichi Nakamura <ynakam@hitachisoft.jp>

diff --git a/selinux/setfiles.c b/selinux/setfiles.c
index befb68f..0f7996f 100644
--- a/selinux/setfiles.c
+++ b/selinux/setfiles.c
@@ -189,7 +189,7 @@
 			file_sep = strrchr(tmp_path, '/');
 			if (file_sep == tmp_path) {
 				file_sep++;
-				p[0] = '\0';
+				path[0] = '\0';
 				p = path;
 			} else if (file_sep) {
 				*file_sep++ = '\0';