Win32: fixed cpu hog after process startup failure. If ngx_spawn_process() failed while starting a process, the process handle was closed but left non-NULL in the ngx_processes[] array. The handle later was used in WaitForMultipleObjects() (if there were multiple worker processes configured and at least one worker process was started successfully), resulting in infinite loop. Reported by Ricardo V G: http://mailman.nginx.org/pipermail/nginx-devel/2012-July/002494.html

--- a/src/os/win32/ngx_process.c
+++ b/src/os/win32/ngx_process.c
@@ -196,6 +196,7 @@ failed:
 
     if (ngx_processes[s].handle) {
         ngx_close_handle(ngx_processes[s].handle);
+        ngx_processes[s].handle = NULL;
     }
 
     return NGX_INVALID_PID;