ui/curses: Fix build with -m32

wchar_t may resolve to be an unsigned long on 32-bit architectures.
Using the %x conversion specifier will then give a compiler warning:

ui/curses.c: In function ‘get_ucs’:
ui/curses.c:492:49: error: format ‘%x’ expects argument of type ‘unsigned int’, but argument 3 has type ‘wchar_t’ {aka ‘long int’} [-Werror=format=]
  492 |         fprintf(stderr, "Could not convert 0x%04x "
      |                                              ~~~^
      |                                                 |
      |                                                 unsigned int
      |                                              %04lx
  493 |                         "from wchar_t to a multibyte character: %s\n",
  494 |                         wch, strerror(errno));
      |                         ~~~
      |                         |
      |                         wchar_t {aka long int}
ui/curses.c:504:49: error: format ‘%x’ expects argument of type ‘unsigned int’, but argument 3 has type ‘wchar_t’ {aka ‘long int’} [-Werror=format=]
  504 |         fprintf(stderr, "Could not convert 0x%04x "
      |                                              ~~~^
      |                                                 |
      |                                                 unsigned int
      |                                              %04lx
  505 |                         "from a multibyte character to UCS-2 : %s\n",
  506 |                         wch, strerror(errno));
      |                         ~~~
      |                         |
      |                         wchar_t {aka long int}

Fix this by casting the wchar_t value to an unsigned long and using %lx
as the conversion specifier.

Fixes: b7b664a4fe9a955338f2e11a0f7433b29c8cbad0
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Message-id: 20190527142540.23255-1-mreitz@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

ui/curses.c

@@ -489,9 +489,9 @@ static uint16_t get_ucs(wchar_t wch, iconv_t conv)
     memset(&ps, 0, sizeof(ps));
     ret = wcrtomb(mbch, wch, &ps);
     if (ret == -1) {
-        fprintf(stderr, "Could not convert 0x%04x "
+        fprintf(stderr, "Could not convert 0x%04lx "
                         "from wchar_t to a multibyte character: %s\n",
-                        wch, strerror(errno));
+                        (unsigned long)wch, strerror(errno));
         return 0xFFFD;
     }
 
@@ -501,9 +501,9 @@ static uint16_t get_ucs(wchar_t wch, iconv_t conv)
     such = sizeof(uch);
 
     if (iconv(conv, &pmbch, &smbch, &puch, &such) == (size_t) -1) {
-        fprintf(stderr, "Could not convert 0x%04x "
+        fprintf(stderr, "Could not convert 0x%04lx "
                         "from a multibyte character to UCS-2 : %s\n",
-                        wch, strerror(errno));
+                        (unsigned long)wch, strerror(errno));
         return 0xFFFD;
     }