arch: powerpc/fadump: Cleaning up inconsistent NULL checks
Cleaning up inconsistent NULL checks. There is otherwise a risk of a possible null pointer dereference. Was largely found by using a static code analysis program called cppcheck. Signed-off-by: NRickard Strandqvist <rickard_strandqvist@spectrumdigital.se> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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