mm/vma: return the exact errno in vms_gather_munmap_vmas()

__split_vma() and mas_store_gfp() returns several types of errno on
failure so don't ignore them in vms_gather_munmap_vmas().  For example,
__split_vma() returns -EINVAL when an unaligned huge page is unmapped. 
This issue is reproduced by ltp memfd_create03 test.

Don't initialise the error variable and assign it when a failure actually
occurs.

[[email protected]: fix whitespace, per Liam]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 6898c9039bc8 ("mm/vma: extract the gathering of vmas from do_vmi_align_munmap()")
Signed-off-by: Xiao Yang <[email protected]>
Suggested-by: Lorenzo Stoakes <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-lkp/[email protected]
Cc: "Liam R. Howlett" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions