[PATCH] (7/11) API improvements

[Petr Rockai <prockai@redhat.com>]

Hi,

this patch improves the API somewhat, by restructuring the way errors are
checked for by the client code: a vg_read_error function is provided for that,
and the vg_read(_for_update) has seen some improvements unrelated to that. It
also makes vg_read_for_update a simple front-end to vg_read, as vg_read will be
needed later to have the same capabilities, easily (this is done through the
READ_FOR_UPDATE flag). I admit that this is a little incoherent together in a
single patch, but that's how things winded up.

Yours,
   Petr.

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-- 
Peter Rockai | me()mornfall!net | prockai()redhat!com
 http://blog.mornfall.net | http://web.mornfall.net

"In My Egotistical Opinion, most people's C programs should be
 indented six feet downward and covered with dirt."
     -- Blair P. Houghton on the subject of C program indentation