Fixing Coverity warnings.

CID 200496
CID 200494
CID 200490
CID 200489
CID 200483
CID 200482
CID 200472
CID 200465

src/nxt_process.c

@@ -299,6 +299,8 @@ nxt_process_daemon(nxt_task_t *task)
     nxt_pid_t     pid;
     const char    *msg;
 
+    fd = -1;
+
     /*
      * fork() followed by a parent process's exit() detaches a child process
      * from an init script or terminal shell process which has started the
@@ -372,6 +374,10 @@ fail:
 
     nxt_log(task, NXT_LOG_CRIT, msg, nxt_errno);
 
+    if (fd != -1) {
+        nxt_fd_close(fd);
+    }
+
     return NXT_ERROR;
 }