blktap: Fix double-free in tapdisk cleanup.

Signed-off-by: Ben Guthro <bguthro@virtualiron.com>
Signed-off-by: Josh Nicholas <jnicholas@virtualiron.com>

tools/blktap/drivers/tapdisk.c

@@ -863,11 +863,7 @@ int main(int argc, char *argv[])
 	ptr = fd_start;
 	while (ptr != NULL) {
 		s = ptr->s;
-
 		unmap_disk(s);
-		free(s->blkif);
-		free(s->ring_info);
-		free(s);
 		close(ptr->tap_fd);
 		ptr = ptr->next;
 	}