use uint64_t for blkdev sizes - #4644

* 'branch-02' of https://github.com/Leefancy/util-linux:
  blkdev: check blkdev_find_size return value in blkdev_get_size

Signed-off-by: Karel Zak <kzak@redhat.com>

For blkdev_get_size() and blkdev_get_sectors(), use uint64_t instead of
"unsigned long long", and use matching variable types at the call sites
rather than casting the pointer argument.

While on it:

* handle fstat() failure in blkdev_get_size(); the following S_ISBLK()
  check read uninitialized memory when fstat() failed

* use %ju and uintmax_t in the mkfs.minix and swapon messages; xgettext
  does not expand PRIu64, so the extracted msgid would never match the
  string looked up by gettext() at run time

Signed-off-by: Karel Zak <kzak@redhat.com>