maple/board.c: brh_get(): Fix using memcpy() to move data between…

… overlapped ranges.

Use `memmove()` instead.

maple/board.c

@@ -131,7 +131,7 @@ brh_get(
                 memcpy(buf, head + 3, size - 3 * sizeof(time_t));
                 tail = (int *) ((char *) tail - size);
                 if ((item = (char *) tail - (char *) head))
-                    memcpy(head, (char *) head + size, item);
+                    memmove(head, (char *) head + size, item);
                 break;
             }
             head = (int *) ((char *) head + size);