ws2_32: Warn the user when his host name is not resolvable

[Bruno Jesus]

A simpler approach to replace http://source.winehq.org/patches/data/108219.
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diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index b6aad67..c3ede5a 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -5621,19 +5621,19 @@ int WINAPI WS_getaddrinfo(LPCSTR nodename, LPCSTR servname, const struct WS_addr
     struct addrinfo *unixaires = NULL;
     int   result;
     struct addrinfo unixhints, *punixhints = NULL;
-    char *hostname = NULL;
+    char *hostname;
     const char *node;
 
     *res = NULL;
     if (!nodename && !servname) return WSAHOST_NOT_FOUND;
 
+    hostname = get_hostname();
+    if (!hostname) return WSA_NOT_ENOUGH_MEMORY;
+
     if (!nodename)
         node = NULL;
     else if (!nodename[0])
-    {
-        node = hostname = get_hostname();
-        if (!node) return WSA_NOT_ENOUGH_MEMORY;
-    }
+        node = hostname;
     else
         node = nodename;
 
@@ -5677,6 +5677,12 @@ int WINAPI WS_getaddrinfo(LPCSTR nodename, LPCSTR servname, const struct WS_addr
     /* getaddrinfo(3) is thread safe, no need to wrap in CS */
     result = getaddrinfo(node, servname, punixhints, &unixaires);
 
+    if (result && !strcmp(hostname, node))
+    {
+        /* If it didn't work it means the host name IP is not in /etc/hosts */
+        ERR_(winediag)("Failed to resolve your host name address, the application may have problems "
+                       "to work properly when accessing the network. You should fix this!\n");
+    }
     TRACE("%s, %s %p -> %p %d\n", debugstr_a(nodename), debugstr_a(servname), hints, res, result);
     HeapFree(GetProcessHeap(), 0, hostname);