UDF: Fix a null pointer dereference in udf_sb_free_partitions
This patch fixes a regression caused by commit bff943af "udf: Fix memory leak when mounting" due to which it was triggering a kernel null point dereference in case of interrupted mount OR when allocating memory to sbi->s_partmaps failed in function udf_sb_alloc_partition_maps. Reported-and-tested-by: NJames Hogan <james@albanarts.com> Signed-off-by: NNamjae Jeon <namjae.jeon@samsung.com> Signed-off-by: NAshish Sangwan <a.sangwan@samsung.com> Signed-off-by: NJan Kara <jack@suse.cz>
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