CVE-2022-50879 objtool: Fix SEGFAULT

In the Linux kernel, the following vulnerability has been resolved: objtool: Fix SEGFAULT findinsn will return NULL in case of failure. Check insn in order to avoid a kernel Oops for NULL pointer dereference...

kernel: objtool: Fix SEGFAULT

A NULL pointer dereference was found in objtool, a build-time tool used during Linux kernel compilation. When findinsn returns NULL on failure, the code proceeds to dereference the NULL pointer, causing objtool to crash with a segmentation fault during kernel build operations...