master 743a95f813: Pacify gcc -Wanalyzer-null-dereference

[Paul Eggert]

branch: master
commit 743a95f8139fb30705352d721f17ff3217e460b6
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Paul Eggert <eggert@cs.ucla.edu>

    Pacify gcc -Wanalyzer-null-dereference
    
    * src/xterm.c (handle_one_xevent): Don’t dereference HOLD_QUIT if
    it’s null.  Potential problem found with gcc 11.2.1 20220127 (Red
    Hat 11.2.1-9), when configured with --enable-gcc-warnings.
---
 src/xterm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/xterm.c b/src/xterm.c
index b9a5355b41..42ab90df75 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -13826,7 +13826,8 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 
        if (x_dnd_in_progress || x_dnd_waiting_for_finish)
          {
-           *hold_quit = inev.ie;
+           if (hold_quit)
+             *hold_quit = inev.ie;
            EVENT_INIT (inev.ie);
          }