Dynamic modules: removed unnecessary initialization.

It became unnecessary after 85dea406e18f.
diff --git a/src/core/ngx_module.c b/src/core/ngx_module.c
index f5ec86a..2d81b38 100644
--- a/src/core/ngx_module.c
+++ b/src/core/ngx_module.c
@@ -27,7 +27,6 @@
 {
     ngx_uint_t  i;
 
-    ngx_max_module = 0;
     for (i = 0; ngx_modules[i]; i++) {
         ngx_modules[i]->index = i;
         ngx_modules[i]->name = ngx_module_names[i];