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tcharding
14f3e1c103b
tcharding committed 668ea1231c3
mmc: core: guard dereference of optional parameter

Various functions take as parameter an optional pointer. Pointer
should be guarded with non-NULL check before dereferencing.

Add non-NULL check before dereference of pointer.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
(cherry picked from commit 9b980d950e5bcdce6dbc15a9c00ff960beeea28b)