does "block: add secure discard" cause an overflow?

[Dan Carpenter]

This is the commit 8d57a98ccd0b44 "block: add secure discard".

The patch adds a letter 'E' to the string in blk_fill_rwbs().
        if (rw & REQ_SECURE)
                rwbs[i++] = 'E';

The problem is that "rwbs" is a 6 character buffer and if all the flags
are set the we'd get "WABSME" which would put us off the end (when you
add the NUL terminator).

regards,
dan carpenter
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