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Description of problem:

If (dev_id->ids & 0xf) < current_id, must updates pos when continue.
Otherwise an infinite loop.

No other places use the pos value, just move to the top of while.

Additional info:
Upstream patch that fixes the bug:

commit c6b8191374d9ad064eb96423400a6314c2d0102e
Author: Kinglong Mee <kinglongmee>
Date:   Tue Jun 30 14:12:38 2015 -0400

    blkmapd: Fix infinite loop when reading serial
    
    If (dev_id->ids & 0xf) < current_id, must updates pos when continue.
    Otherwise an infinite loop.
    
    No other places use the pos value, just move to the top of while.
    
    Signed-off-by: Kinglong Mee <kinglongmee>
    Signed-off-by: Steve Dickson <steved>

Since there is no obvious reproducer, set "SanityOnly" 

Finish regression test and move to VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2196.html