Patch merged into coreboot/master: be96510 smbus: Add guards to avoid calling NULL.

the following patch was just integrated into master:
commit be9651002c3473df0f3950b24636743beb5e48f1
Author: Vladimir Serbinenko 
Date:   Mon Jan 27 23:46:46 2014 +0100

smbus: Add guards to avoid calling NULL.

Many of SMBus functions are unavailable on many controllers.
    While calling unavailable function is bad, it shouldn't lead
    to spectacular crash.

Change-Id: I7912f3bbbb438603893223a586dcedf57e8a7e28
    Signed-off-by: Vladimir Serbinenko

See http://review.coreboot.org/4837 for details.

-gerrit