[binutils-gdb] gdb/tui: make use of a scoped_restore

[Andrew Burgess <aburgess@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2e10cefd83b6a5b0b3745da1134d35a4924db6c5

commit 2e10cefd83b6a5b0b3745da1134d35a4924db6c5
Author: Andrew Burgess <aburgess@redhat.com>
Date:   Thu Jan 5 15:13:54 2023 +0000

    gdb/tui: make use of a scoped_restore
    
    Make use of a scoped_restore object in tui_mld_read_key instead of
    doing a manual save/restore.
    
    I don't think the existing code can throw an exception, so this is
    just a cleanup rather than a bug fix.
    
    There should be no user visible changes after this commit.

Diff:
---
 gdb/tui/tui-io.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index 2f39e34df2f..a17cf38a1f2 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -773,14 +773,10 @@ tui_mld_getc (FILE *fp)
 static int
 tui_mld_read_key (const struct match_list_displayer *displayer)
 {
-  rl_getc_func_t *prev = rl_getc_function;
-  int c;
-
   /* We can't use tui_getc as we need NEWLINE to not get emitted.  */
-  rl_getc_function = tui_mld_getc;
-  c = rl_read_key ();
-  rl_getc_function = prev;
-  return c;
+  scoped_restore restore_getc_function
+    = make_scoped_restore (&rl_getc_function, tui_mld_getc);
+  return rl_read_key ();
 }
 
 /* TUI version of rl_completion_display_matches_hook.