Backport checkin:
Fix a segfault when b"" was passed to b2a_qp() -- it was using strchr() instead of memchr().
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0999a1150a
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@ -1150,7 +1150,7 @@ binascii_b2a_qp (PyObject *self, PyObject *args, PyObject *kwargs)
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/* XXX: this function has the side effect of converting all of
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* the end of lines to be the same depending on this detection
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* here */
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p = (unsigned char *) strchr((char *)data, '\n');
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p = (unsigned char *) memchr(data, '\n', datalen);
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if ((p != NULL) && (p > data) && (*(p-1) == '\r'))
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crlf = 1;
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