fix crashes when mounting legacy file system with sector size > PAGE_SIZE

Hi all,

due to an almost comical failure on my part, my work in progress test
case failed to create any file system on a 64k block size loop device,
and then tried to mount it, leading to a probe of file system built
into my kernel.  Roughly the first half of the series are file systems
that actually crashed, but I fixed up all the pattern of missing
error handling that I saw.

Diffstat:
 affs/affs.h     |    5 -----
 affs/super.c    |    6 ++++--
 befs/linuxvfs.c |    3 ++-
 bfs/inode.c     |    3 ++-
 hpfs/super.c    |    3 ++-
 isofs/inode.c   |    3 ++-
 jfs/super.c     |    3 ++-
 minix/inode.c   |    3 ++-
 ntfs3/super.c   |    8 ++++++--
 omfs/inode.c    |    6 ++++--
 qnx4/inode.c    |    3 ++-
 11 files changed, 28 insertions(+), 18 deletions(-)