[niepce] npc-fwk: drop explicitely the CString

[Hubert Figuière <hub src gnome org>]

commit b02d8df49a4003b7e41299f9577e7d05a8d6a030
Author: Hubert Figuière <hub figuiere net>
Date:   Tue Mar 15 00:43:30 2022 -0400

    npc-fwk: drop explicitely the CString

 crates/npc-fwk/src/capi.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/crates/npc-fwk/src/capi.rs b/crates/npc-fwk/src/capi.rs
index 207f684..aeda373 100644
--- a/crates/npc-fwk/src/capi.rs
+++ b/crates/npc-fwk/src/capi.rs
@@ -26,5 +26,5 @@ use std::ffi::CString;
 /// Dereference the pointer
 #[no_mangle]
 pub unsafe extern "C" fn rust_cstring_delete(string: *mut c_char) {
-    CString::from_raw(string);
+    drop(CString::from_raw(string));
 }