GPT probe: signature vs checksum

[Andrew Clausen]

Hi all  (/me glances in Matt's direction ;)

I'm currently wading through the GPT code, the main goal being
porting to 1.5.x... but I can never resist "cleaning" (very subjective)
code I play with *grin*

ANYway... the GPT probing code has the wrong semantics, IMHO.  It
is checking for a VALID gpt table, when it should merely be searching
for a gpt table.  It should be checking signatures ONLY.  Not
checksums.  (And perhaps this 0xEE partition thing).

Checksum checking should be happening during gpt_open() (1.4.x)
or gpt_read (1.5.x).

Andrew