textsearch: fix Boyer-Moore text search bug
The current logic has a bug which cannot find matching pattern, if the pattern is matched from the first character of target string. for example: pattern=abc, string=abcdefg pattern=a, string=abcdefg Searching algorithm should return 0 for those things. Signed-off-by: Joonwoo Park <joonwpark81@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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