patch 8.2.0004: get E685 and E931 if buffer reload is interrupted

Problem:    Get E685 and E931 if buffer reload is interrupted.
Solution:   Do not abort deleting a dummy buffer. (closes #5361)
diff --git a/src/quickfix.c b/src/quickfix.c
index 206e901..2e07403 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -1925,7 +1925,7 @@
 	{
 	    // If the quickfix buffer is not loaded in any window, then
 	    // wipe the buffer.
-	    close_buffer(NULL, qfbuf, DOBUF_WIPE, FALSE);
+	    close_buffer(NULL, qfbuf, DOBUF_WIPE, FALSE, FALSE);
 	    qi->qf_bufnr = INVALID_QFBUFNR;
 	}
     }
@@ -6311,7 +6311,7 @@
 {
     if (curbuf != buf)		// safety check
     {
-	close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE);
+	close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE, TRUE);
 
 	// When autocommands/'autochdir' option changed directory: go back.
 	restore_start_dir(dirname_start);