freevxfs: possible null pointer dereference fix

sb_read may return NULL, so let's explicitly check it.

Signed-off-by: Dmitriy Monakhov <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
2 files changed