[PATCH v3 2/4] qemu-keymap: Fix memory leaks

[Daniel Xu]

When building with `--enable-sanitizers`, I was getting quite a few
memory leak crashes from ASAN:

        [21/574] Generating pc-bios/keymaps/fr-ch with a custom command
        FAILED: pc-bios/keymaps/fr-ch
        /home/dxu/dev/qemu/build/qemu-keymap -f pc-bios/keymaps/fr-ch -l ch -v 
fr

        =================================================================
        ==3232549==ERROR: LeakSanitizer: detected memory leaks

        Direct leak of 1424 byte(s) in 1 object(s) allocated from:
            #0 0x7f32636bf411 in __interceptor_calloc /usr/src/debug/gcc/gcc/...
            #1 0x7f32635db73e  (/usr/lib/libxkbcommon.so.0+0x2273e)

Fix leaks by correctly decrementing refcounts on xkb structs.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
 qemu-keymap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/qemu-keymap.c b/qemu-keymap.c
index 229866e004..ed8cee3467 100644
--- a/qemu-keymap.c
+++ b/qemu-keymap.c
@@ -203,6 +203,7 @@ int main(int argc, char *argv[])
     map = xkb_keymap_new_from_names(ctx, &names, XKB_KEYMAP_COMPILE_NO_FLAGS);
     if (!map) {
         /* libxkbcommon prints error */
+        xkb_context_unref(ctx);
         exit(1);
     }
 
@@ -227,7 +228,11 @@ int main(int argc, char *argv[])
     state = xkb_state_new(map);
     xkb_keymap_key_for_each(map, walk_map, state);
     xkb_state_unref(state);
+    xkb_keymap_unref(map);
+    xkb_context_unref(ctx);
     state = NULL;
+    map = NULL;
+    ctx = NULL;
 
     /* add quirks */
     fprintf(outfile,
-- 
2.39.1