nfsd: use swap() in sort_pacl_range()

Use kernel.h macro definition.

Thanks to Julia Lawall for Coccinelle scripting support.
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4acl.c

@@ -372,7 +372,6 @@ pace_gt(struct posix_acl_entry *pace1, struct posix_acl_entry *pace2)
 static void
 sort_pacl_range(struct posix_acl *pacl, int start, int end) {
 	int sorted = 0, i;
-	struct posix_acl_entry tmp;
 
 	/* We just do a bubble sort; easy to do in place, and we're not
 	 * expecting acl's to be long enough to justify anything more. */
@@ -382,9 +381,8 @@ sort_pacl_range(struct posix_acl *pacl, int start, int end) {
 			if (pace_gt(&pacl->a_entries[i],
 				    &pacl->a_entries[i+1])) {
 				sorted = 0;
-				tmp = pacl->a_entries[i];
-				pacl->a_entries[i] = pacl->a_entries[i+1];
-				pacl->a_entries[i+1] = tmp;
+				swap(pacl->a_entries[i],
+				     pacl->a_entries[i + 1]);
 			}
 		}
 	}