Fixing build on Solaris.

src/nxt_port.h

@@ -39,7 +39,7 @@ struct nxt_port_handlers_s {
 
 
 #define nxt_port_handler_idx(name)                                            \
-    ( &((nxt_port_handlers_t *) 0)->name - (nxt_port_handler_t *) 0)
+    ( offsetof(nxt_port_handlers_t, name) / sizeof(nxt_port_handler_t) )
 
 
 typedef enum {

src/nxt_port_socket.c

@@ -572,7 +572,7 @@ nxt_port_lvlhsh_frag_alloc(void *ctx, size_t size)
 static void
 nxt_port_lvlhsh_frag_free(void *ctx, void *p)
 {
-    return nxt_mp_free(ctx, p);
+    nxt_mp_free(ctx, p);
 }