selftests/net: so_txtime: remove unneeded semicolon

Eliminate the following coccicheck warning:
./tools/testing/selftests/net/so_txtime.c:199:3-4: Unneeded semicolon
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/so_txtime.c

@@ -196,7 +196,7 @@ static void do_recv_errqueue_timeout(int fdt)
 		default:
 			error(1, 0, "errqueue: errno %u code %u\n",
 			      err->ee_errno, err->ee_code);
-		};
+		}
 
 		tstamp = ((int64_t) err->ee_data) << 32 | err->ee_info;
 		tstamp -= (int64_t) glob_tstart;