patch 9.1.1287: quickfix code can be further improved

Problem:  quickfix code can be further improved (after v9.1.1283)
Solution: slightly refactor quickfix.c (Hirohito Higashi)

- remove error message output
- adjust comments
- rename functions:
  - qf_init_quickfix_stack() --> qf_init_stack()
  - qf_resize_quickfix_stack() --> qf_resize_stack()
  - qf_resize_stack() --> qf_resize_stack_base()

Now qf_alloc_stack() can handle both quickfix/location lists.

closes: #17068

Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/proto/quickfix.pro b/src/proto/quickfix.pro
index 8102a8f..6cd7cfc 100644
--- a/src/proto/quickfix.pro
+++ b/src/proto/quickfix.pro
@@ -3,9 +3,9 @@
 int qf_stack_get_bufnr(void);
 void qf_free_all(win_T *wp);
 void check_quickfix_busy(void);
-int qf_resize_quickfix_stack(int n);
+int qf_resize_stack(int n);
 int ll_resize_stack(win_T *wp, int n);
-int qf_init_quickfix_stack(void);
+void qf_init_stack(void);
 void copy_loclist_stack(win_T *from, win_T *to);
 void qf_jump(qf_info_T *qi, int dir, int errornr, int forceit);
 void qf_list(exarg_T *eap);