selftests/net: psock_fanout: fix clang issues for target arch PowerPC

Clang 9 threw:
warning: format specifies type 'unsigned short' but the argument has \
type 'int' [-Wformat]
                typeflags, PORT_BASE, PORT_BASE + port_off);

Tested: make -C tools/testing/selftests TARGETS="net" run_tests

Fixes: 77f65ebd ("packet: packet fanout rollover during socket overload")
Signed-off-by: NTanner Love <tannerlove@google.com>
Acked-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/psock_fanout.c

@@ -350,7 +350,8 @@ static int test_datapath(uint16_t typeflags, int port_off,
 	int fds[2], fds_udp[2][2], ret;
 
 	fprintf(stderr, "\ntest: datapath 0x%hx ports %hu,%hu\n",
-		typeflags, PORT_BASE, PORT_BASE + port_off);
+		typeflags, (uint16_t)PORT_BASE,
+		(uint16_t)(PORT_BASE + port_off));
 
 	fds[0] = sock_fanout_open(typeflags, 0);
 	fds[1] = sock_fanout_open(typeflags, 0);