[PATCH v6 3/4] curses: Fixes curses compiling errors.

[Yonggang Luo <luoyonggang@gmail.com>]

This is the compiling error:
../ui/curses.c: In function 'curses_refresh':
../ui/curses.c:256:5: error: 'next_maybe_keycode' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  256 |     curses2foo(_curses2keycode, _curseskey2keycode, chr, maybe_keycode)
      |     ^~~~~~~~~~
../ui/curses.c:302:32: note: 'next_maybe_keycode' was declared here
  302 |             enum maybe_keycode next_maybe_keycode;
      |                                ^~~~~~~~~~~~~~~~~~
../ui/curses.c:256:5: error: 'maybe_keycode' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  256 |     curses2foo(_curses2keycode, _curseskey2keycode, chr, maybe_keycode)
      |     ^~~~~~~~~~
../ui/curses.c:265:24: note: 'maybe_keycode' was declared here
  265 |     enum maybe_keycode maybe_keycode;
      |                        ^~~~~~~~~~~~~
cc1.exe: all warnings being treated as errors

gcc version 10.2.0 (Rev1, Built by MSYS2 project)

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 ui/curses.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ui/curses.c b/ui/curses.c
index 12bc682cf9..e4f9588c3e 100644
--- a/ui/curses.c
+++ b/ui/curses.c
@@ -262,7 +262,7 @@ static int curses2foo(const int _curses2foo[], const int _curseskey2foo[],
 static void curses_refresh(DisplayChangeListener *dcl)
 {
     int chr, keysym, keycode, keycode_alt;
-    enum maybe_keycode maybe_keycode;
+    enum maybe_keycode maybe_keycode = CURSES_KEYCODE;
 
     curses_winch_check();
 
@@ -299,7 +299,7 @@ static void curses_refresh(DisplayChangeListener *dcl)
 
         /* alt or esc key */
         if (keycode == 1) {
-            enum maybe_keycode next_maybe_keycode;
+            enum maybe_keycode next_maybe_keycode = CURSES_KEYCODE;
             int nextchr = console_getch(&next_maybe_keycode);
 
             if (nextchr != -1) {
-- 
2.28.0.windows.1