wwanhwsim: fix possible memory leak in wwanhwsimdevnew()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.76 by commit 50c31fa952309536c6e4461ff815ddccc8dff9d5, it was introduced in version v5.14 by commit f36a111a74e71edbba27d4c0cf3d7bbccc172108. For more details please see the references link.