seq_file: always clear m->count when we free m->buf
Once we'd freed m->buf, m->count should become zero - we have no valid contents reachable via m->buf. Reported-by: NCharley (Hao Chuan) Chu <charley.chu@broadcom.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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