[CELL] fix cbe_thermal for legacy SLOF tree.
Previous patch changed based on Christian Krafft's comment. On some legacy SLOF tree the generic code is unable to ioremap some Cell BE registers. Therefore the "generic" functions are returning a NULL pointer, triggering a crash on such platforms. Let's handle this more gracefully. Signed-off-by: NJean-Christophe DUBOIS <jcd@tribudubois.net> Acked-by: NChristian Kraff <krafft@de.ibm.com> Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com>
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