mountd: fix path comparison for v4 crossmnt

From: J. Bruce Fields <bfields@citi.umich.edu>

This was obviously wrong, since path[strlen(path)] == '\0'
should always be true.

NB: just as one usage of 'path' should be 'subpath', so
also the other usage in is_mountpoint should be.
  bnc#648923

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
Acked-by: NeilBrown <neilb@suse.de>
---
 utils/mountd/cache.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- nfs-utils-1.2.1.orig/utils/mountd/cache.c
+++ nfs-utils-1.2.1/utils/mountd/cache.c
@@ -622,8 +622,8 @@ static int is_subdirectory(char *subpath
 	int l = strlen(path);
 
 	return strcmp(subpath, path) == 0
-		|| (strncmp(subpath, path, l) == 0 && path[l] == '/'
-		    && is_mountpoint(path));
+		|| (strncmp(subpath, path, l) == 0 && subpath[l] == '/'
+		    && is_mountpoint(subpath));
 }
 
 static int path_matches(nfs_export *exp, char *path)