jbd2: make jbd2_handle_buffer_credits() handle reserved handles
The helper jbd2_handle_buffer_credits() doesn't correctly handle reserved handles which can lead to crashes. Fix it getting of journal pointer to work for reserved handles as well. Fixes: a9a8344e ("ext4, jbd2: Provide accessor function for handle credits") Reported-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20191115102210.29445-1-jack@suse.czSigned-off-by: Theodore Ts'o <tytso@mit.edu>
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