cifs, msdos, vfat, hfs+: don't bother with parent in ->d_compare()

dentry->d_sb is just as good as parent->d_sb

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 6ccdf3f..e60a908 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -141,7 +141,7 @@
 static int vfat_cmpi(const struct dentry *parent, const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name)
 {
-	struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io;
+	struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
 	unsigned int alen, blen;
 
 	/* A filename cannot end in '.' or we treat it like it has none */