c_run_key_action(): Fix segfault on `in_mode`

Finally figured out where the problem was with the `in_mode` on my
`CKeyActionResult` getting freed too early.

It happens because we're trying to use the reference to the `in_mode`
slice from the `KeyActionResult` returned by
`run_key_action_for_mode()`. We were putting that reference in the
`in_mode` of the `CKeyActionResult` returned by `c_run_key_action()`,
but it would get freed in that function.

In order to make it last indefinitely, we needed to convert it into a
raw boxed pointer to prevent Rust from deallocating it. This does mean
we now have a memory leak, but we'll just have to make a call into Rust
to free it from the C code.

1 files changed, 2 insertions, 1 deletions

diff --git a/moder.c b/moder.c
index c50a7d5..1dd4e52 100644
--- a/moder.c
+++ b/moder.c
@@ -10,7 +10,7 @@ int main() {
 		.length = SIZE
 	};
 	const CKeyActionResult *mode = c_run_key_action(mode_trigger, NULL);
-	/* printf("%d\n", *mode->kind); */
+	printf("%d\n", *mode->kind);
 
 	HeadphoneButton buttons[] = {HeadphoneButton_Down};
 	Trigger trigger = {
@@ -21,6 +21,7 @@ int main() {
 
 	printf("%d\n", *result->kind);
 	printf("%s", result->action);
+	/* printf("\n%d\n", *mode->kind); */
 
 	return 0;
 }