ext2fs: fix ext2fs_warn_bitmap32() return warning

This was reported as "control reaches end of non-void function",
but comparing to other similar functions it should be a void
function.  Since it is only declared in the "private" ext2fsP.h
header, it should be OK to change the function prototype.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2 files changed