musl has padding on struct msghdr fields so the designated initialiser fails with int-conversion:

src/libs/zbxsysinfo/linux/net.c:115:95: error: initialization of 'int' from 'void *' makes integer from pointer without a cast [-Werror=int-conversion]
  115 |         struct msghdr           s_msg = { (void *)&s_sa, sizeof(struct sockaddr_nl), s_io, 1, NULL, 0, 0};

this is because the assignment becomes to padding, and the resulting struct is broken
diff --git a/src/libs/zbxsysinfo/linux/net.c b/src/libs/zbxsysinfo/linux/net.c
index 4b0a634..1ccc2c4 100644
--- a/src/libs/zbxsysinfo/linux/net.c
+++ b/src/libs/zbxsysinfo/linux/net.c
@@ -112,13 +112,27 @@ static int	find_tcp_port_by_state_nl(unsigned short port, int state, int *found)
 
 	struct sockaddr_nl	s_sa = { AF_NETLINK, 0, 0, 0 };
 	struct iovec		s_io[1] = { { &request, sizeof(request) } };
-	struct msghdr		s_msg = { (void *)&s_sa, sizeof(struct sockaddr_nl), s_io, 1, NULL, 0, 0};
+	struct msghdr		s_msg;
+	s_msg.msg_name = (void *)&s_sa;
+	s_msg.msg_namelen = sizeof(struct sockaddr_nl);
+	s_msg.msg_iov = s_io;
+	s_msg.msg_iovlen = 1;
+	s_msg.msg_control = NULL;
+	s_msg.msg_controllen = 0;
+	s_msg.msg_flags = 0;
 
 	char			buffer[BUFSIZ] = { 0 };
 
 	struct sockaddr_nl	r_sa = { AF_NETLINK, 0, 0, 0 };
 	struct iovec		r_io[1] = { { buffer, BUFSIZ } };
-	struct msghdr		r_msg = { (void *)&r_sa, sizeof(struct sockaddr_nl), r_io, 1, NULL, 0, 0};
+	struct msghdr		r_msg;
+	r_msg.msg_name = (void *)&r_sa;
+	r_msg.msg_namelen = sizeof(struct sockaddr_nl);
+	r_msg.msg_iov = r_io;
+	r_msg.msg_iovlen = 1;
+	r_msg.msg_control = NULL;
+	r_msg.msg_controllen = 0;
+	r_msg.msg_flags = 0;
 
 	struct nlmsghdr		*r_hdr;