Fix mapped file leak on invalid avmpack open

The generic_unix invalid-pack rejection in sys_open_avm_from_file
returned without releasing the mapping, leaking it and its file
descriptor. Pre-existing, but truncated packs now take this path.

Signed-off-by: Davide Bettio <davide@uninstall.it>

Author: bettio

CHANGELOG.md

@@ -94,6 +94,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed AVM pack lookups not finding sections placed after a data file
 - Fixed an out-of-bounds read crashing the VM on an AVM pack section lookup miss (e.g. `atomvm:read_priv/2` for an unpacked file)
 - Fixed truncated or oversized AVM packs being accepted; they are now rejected at load instead of failing late
+- Fixed generic_unix leaking the file mapping when rejecting an invalid `.avm` file
 
 ## [0.7.0-alpha.1] - 2026-04-06
 

src/platforms/generic_unix/lib/sys.c

@@ -436,6 +436,7 @@ enum OpenAVMResult sys_open_avm_from_file(
         return AVM_OPEN_CANNOT_OPEN;
     }
     if (UNLIKELY(!avmpack_is_complete(mapped->mapped, (uint32_t) mapped->size))) {
+        mapped_file_close(mapped);
         return AVM_OPEN_INVALID;
     }