nfsd: Fix misuse of strlcpy

Probable cut&paste typo - use the correct field size.

(Not currently a practical problem since these two fields have the same
size, but we should fix it anyway.)

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 2961016..d1f2852 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -83,7 +83,7 @@ ent_init(struct cache_head *cnew, struct cache_head *citm)
 	new->type = itm->type;
 
 	strlcpy(new->name, itm->name, sizeof(new->name));
-	strlcpy(new->authname, itm->authname, sizeof(new->name));
+	strlcpy(new->authname, itm->authname, sizeof(new->authname));
 }
 
 static void