parted: fix several integer overflows

parted: fix several integer overflows

Integer overflows were found in libparted/labels/dvh.c, while attemptting
to assign unsigned int values to int types in some places. These overflows
only can be observed on BE platforms like MIPS, when the "WORDS_BIGENDIAN"
macro is defined in parted.

Defined by unsigned int instead.

(From OE-Core rev: 9acaa764a4df8d589011ff597bba2afc05d6e78b)

Signed-off-by: Ming Liu <ming.liu@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>