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>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>