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 <[e-mail]>
Signed-off-by: Yang Li <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

tools/testing/selftests/net/so_txtime.c

···
 		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;