Preserve one byte for end of string character in form_update_line()
Bug-Debian: https://github.com/tats/w3m/issues/82 cf. https://github.com/tats/w3m/issues/68#issuecomment-266214643
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							| @@ -319,7 +319,7 @@ form_update_line(Line *line, char **str, int spos, int epos, int width, | ||||
|     } | ||||
|     pos += width - w; | ||||
|  | ||||
|     len = line->len + pos + spos - epos; | ||||
|     len = line->len + pos + spos - epos + 1; | ||||
|     buf = New_N(char, len); | ||||
|     prop = New_N(Lineprop, len); | ||||
|     bcopy((void *)line->lineBuf, (void *)buf, spos * sizeof(char)); | ||||
|   | ||||
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