kernel: mm/vmalloc: fix vmalloc which may return null if called with __GFP_NOFAIL

In the Linux kernel, the following vulnerability has been resolved: mm/vmalloc: fix vmalloc which may return null if called with GFPNOFAIL commit a421ef303008 "mm: allow !GFPKERNEL allocations for kvmalloc" includes support for GFPNOFAIL, but it presents a conflict with commit dd544141b9eb...