perf: always check data when looking for last char of needle

[gurgunday]

Forgot this one

Since we've now established that:

• The lookbehind length is at max needleLength - 1, we have in the beginning pos = -lookbehind_size >= -(needleLength - 1)
• And since we start by checking the last character, that last char will always be in data as pos + needleLength - 1 >= 0, and pos values equal to and larger than 0 correspond to the incoming data rather than the lookbehind, so we can safely remove the method

In short, ch will always be in data

[zekth]

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