ext4: fix fencepost in s_first_meta_bg validation
It is OK for s_first_meta_bg to be equal to the number of block group descriptor blocks. (It rarely happens, but it shouldn't cause any problems.) https://bugzilla.kernel.org/show_bug.cgi?id=194567 Fixes: 3a4b77cdSigned-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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