net: smc: fix different types in min()

Fix build:

 include/linux/minmax.h:45:25: note: in expansion of macro ‘__careful_cmp’
   45 | #define min(x, y)       __careful_cmp(x, y, <)
      |                         ^~~~~~~~~~~~~
 net/smc/smc_tx.c:150:24: note: in expansion of macro ‘min’
  150 |         corking_size = min(sock_net(&smc->sk)->smc.sysctl_autocorking_size,
      |                        ^~~

Fixes: 12bbb0d1 ("net/smc: add sysctl for autocorking")
Link: https://lore.kernel.org/r/20220301222446.1271127-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/smc/smc_tx.c

@@ -147,8 +147,8 @@ static bool smc_should_autocork(struct smc_sock *smc)
 	struct smc_connection *conn = &smc->conn;
 	int corking_size;
 
-	corking_size = min(sock_net(&smc->sk)->smc.sysctl_autocorking_size,
-			   conn->sndbuf_desc->len >> 1);
+	corking_size = min_t(unsigned int, conn->sndbuf_desc->len >> 1,
+			     sock_net(&smc->sk)->smc.sysctl_autocorking_size);
 
 	if (atomic_read(&conn->cdc_pend_tx_wr) == 0 ||
 	    smc_tx_prepared_sends(conn) > corking_size)