libpciaccess: Changes to 'master'

[Daniel Drake]

 src/common_io.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

New commits:
commit a798395a1bfd9d06d40e2d8d14377a156c94429a
Author: Daniel Drake <dsd at laptop.org>
Date:   Fri Nov 25 12:28:48 2011 -0600

    delete_io_handle: fix deletion of last handle
    
    When num_ios goes from 1 to 0, a realloc(ios, 0); call is made.
    This is equivalent to free(ios) and NULL is returned.
    
    However, the previous logic in the code incorrectly discards this NULL
    return value. When we next call new_io_handle(), realloc(ios, X) is
    called with "ios" pointing to freed memory. This causes glibc to abort.
    
    Correct this logic to detect the 1-to-0 case and handle it correctly.
    Other cases are unchanged; there is still value in checking the
    return value from realloc() as it also returns NULL on error.
    
    Signed-off-by: Daniel Drake <dsd at laptop.org>
    Reviewed-by: Alan Coopersmith <alan.coopersmith at oracle.com>