inet.h: Consistently name some inet <-> ipaddr conversion macros
They operate on ip4_addr_t, not on ip_addr_t
This should be clearly visible in their names
diff --git a/src/api/netdb.c b/src/api/netdb.c
index ef0c79b..9361913 100644
--- a/src/api/netdb.c
+++ b/src/api/netdb.c
@@ -382,7 +382,7 @@
 #if LWIP_IPV4
     struct sockaddr_in *sa4 = (struct sockaddr_in*)sa;
     /* set up sockaddr */
-    inet_addr_from_ipaddr(&sa4->sin_addr, ip_2_ip4(&addr));
+    inet4_addr_from_ip4addr(&sa4->sin_addr, ip_2_ip4(&addr));
     sa4->sin_family = AF_INET;
     sa4->sin_len = sizeof(struct sockaddr_in);
     sa4->sin_port = lwip_htons((u16_t)port_nr);
diff --git a/src/api/sockets.c b/src/api/sockets.c
index 960ac7e..ba8d18b 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -82,10 +82,10 @@
       (sin)->sin_len = sizeof(struct sockaddr_in); \
       (sin)->sin_family = AF_INET; \
       (sin)->sin_port = lwip_htons((port)); \
-      inet_addr_from_ipaddr(&(sin)->sin_addr, ipaddr); \
+      inet4_addr_from_ip4addr(&(sin)->sin_addr, ipaddr); \
       memset((sin)->sin_zero, 0, SIN_ZERO_LEN); }while(0)
 #define SOCKADDR4_TO_IP4ADDR_PORT(sin, ipaddr, port) do { \
-    inet_addr_to_ipaddr(ip_2_ip4(ipaddr), &((sin)->sin_addr)); \
+    inet4_addr_to_ip4addr(ip_2_ip4(ipaddr), &((sin)->sin_addr)); \
     (port) = lwip_ntohs((sin)->sin_port); }while(0)
 #endif /* LWIP_IPV4 */
 
@@ -2001,7 +2001,7 @@
       if (NETCONNTYPE_GROUP(netconn_type(sock->conn)) != NETCONN_UDP) {
         return ENOPROTOOPT;
       }
-      inet_addr_from_ipaddr((struct in_addr*)optval, udp_get_multicast_netif_addr(sock->conn->pcb.udp));
+      inet4_addr_from_ip4addr((struct in_addr*)optval, udp_get_multicast_netif_addr(sock->conn->pcb.udp));
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_IF) = 0x%"X32_F"\n",
                   s, *(u32_t *)optval));
       break;
@@ -2365,7 +2365,7 @@
       {
         ip4_addr_t if_addr;
         LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB_TYPE(sock, optlen, struct in_addr, NETCONN_UDP);
-        inet_addr_to_ipaddr(&if_addr, (const struct in_addr*)optval);
+        inet4_addr_to_ip4addr(&if_addr, (const struct in_addr*)optval);
         udp_set_multicast_netif_addr(sock->conn->pcb.udp, &if_addr);
       }
       break;
@@ -2389,8 +2389,8 @@
         ip4_addr_t if_addr;
         ip4_addr_t multi_addr;
         LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB_TYPE(sock, optlen, struct ip_mreq, NETCONN_UDP);
-        inet_addr_to_ipaddr(&if_addr, &imr->imr_interface);
-        inet_addr_to_ipaddr(&multi_addr, &imr->imr_multiaddr);
+        inet4_addr_to_ip4addr(&if_addr, &imr->imr_interface);
+        inet4_addr_to_ip4addr(&multi_addr, &imr->imr_multiaddr);
         if (optname == IP_ADD_MEMBERSHIP) {
           if (!lwip_socket_register_membership(s, &if_addr, &multi_addr)) {
             /* cannot track membership (out of memory) */
diff --git a/src/include/lwip/inet.h b/src/include/lwip/inet.h
index 17edef3..636f157 100644
--- a/src/include/lwip/inet.h
+++ b/src/include/lwip/inet.h
@@ -132,10 +132,10 @@
 
 #if LWIP_IPV4
 
-#define inet_addr_from_ipaddr(target_inaddr, source_ipaddr) ((target_inaddr)->s_addr = ip4_addr_get_u32(source_ipaddr))
-#define inet_addr_to_ipaddr(target_ipaddr, source_inaddr)   (ip4_addr_set_u32(target_ipaddr, (source_inaddr)->s_addr))
+#define inet4_addr_from_ip4addr(target_inaddr, source_ipaddr) ((target_inaddr)->s_addr = ip4_addr_get_u32(source_ipaddr))
+#define inet4_addr_to_ip4addr(target_ipaddr, source_inaddr)   (ip4_addr_set_u32(target_ipaddr, (source_inaddr)->s_addr))
 /* ATTENTION: the next define only works because both s_addr and ip4_addr_t are an u32_t effectively! */
-#define inet_addr_to_ipaddr_p(target_ip4addr_p, source_inaddr)   ((target_ip4addr_p) = (ip4_addr_t*)&((source_inaddr)->s_addr))
+#define inet4_addr_to_ip4addr_p(target_ip4addr_p, source_inaddr)   ((target_ip4addr_p) = (ip4_addr_t*)&((source_inaddr)->s_addr))
 
 /* directly map this to the lwip internal functions */
 #define inet_addr(cp)                   ipaddr_addr(cp)