[nrf fromlist] log: net: Fix build warning with IPv6 disabled

Building the net logger backend with IPv4 only gives the following
warning:

log_backend_net.c:116:31: warning: array subscript 'struct sockaddr[0]'
is partly outside array bounds of 'struct sockaddr_in[1]'
[-Warray-bounds] local_addr->sa_family = server_addr.sa_family;

hence assign the address family directly to sockaddr_in/6 structs.

Upstream PR: zephyrproject-rtos/zephyr#79375

Signed-off-by: Robert Lubos <[email protected]>

Author: rlubos

subsys/logging/backends/log_backend_net.c

@@ -99,12 +99,14 @@ static int do_net_init(struct log_backend_net_ctx *ctx)
 	if (IS_ENABLED(CONFIG_NET_IPV4) && server_addr.sa_family == AF_INET) {
 		local_addr = (struct sockaddr *)&local_addr4;
 		server_addr_len = sizeof(struct sockaddr_in);
+		local_addr4.sin_family = AF_INET;
 		local_addr4.sin_port = 0U;
 	}
 
 	if (IS_ENABLED(CONFIG_NET_IPV6) && server_addr.sa_family == AF_INET6) {
 		local_addr = (struct sockaddr *)&local_addr6;
 		server_addr_len = sizeof(struct sockaddr_in6);
+		local_addr6.sin6_family = AF_INET6;
 		local_addr6.sin6_port = 0U;
 	}
 
@@ -113,8 +115,6 @@ static int do_net_init(struct log_backend_net_ctx *ctx)
 		return -EINVAL;
 	}
 
-	local_addr->sa_family = server_addr.sa_family;
-
 	if (ctx->is_tcp) {
 		proto = IPPROTO_TCP;
 		type = SOCK_STREAM;