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upas/fs: fix memory leak in ref822()

--- a/sys/src/cmd/upas/fs/mbox.c

+++ b/sys/src/cmd/upas/fs/mbox.c

@@ -888,7 +888,8 @@

 			free(a[0]);

 			memmove(&a[0], &a[1], (Nref - 1) * sizeof(a[0]));

 			j--;

-		}

+		} if(a[j] != nil)

+			continue;

 		a[j] = strdup(f[i]);

 	}

 	free(s);