[nrf fromtree] net: dns: Increase the size of dispatcher table

The dispatcher table needs to be large enough to have support
for all file descriptor values.

Fixes #79042

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

subsys/net/lib/dns/dispatcher.c

@@ -29,7 +29,7 @@ NET_BUF_POOL_DEFINE(dns_msg_pool, DNS_RESOLVER_BUF_CTR,
 
 static struct socket_dispatch_table {
 	struct dns_socket_dispatcher *ctx;
-} dispatch_table[CONFIG_NET_SOCKETS_POLL_MAX];
+} dispatch_table[CONFIG_ZVFS_OPEN_MAX];
 
 static int dns_dispatch(struct dns_socket_dispatcher *dispatcher,
 			int sock, struct sockaddr *addr, size_t addrlen,

subsys/net/lib/sockets/Kconfig

@@ -50,6 +50,7 @@ config NET_SOCKETS_POLL_MAX
 	default 6 if WIFI_NM_WPA_SUPPLICANT
 	default 4 if SHELL_BACKEND_TELNET
 	default 3
+	range 1 ZVFS_OPEN_MAX
 	help
 	  Maximum number of entries supported for poll() call.