Bug in sendContent_P

[JohnSL]

It looks like there is a bug in the following line of sendContent_P:

contentUnitLen = contentNext - content;

I believe the memccpy_P function returns the last copied byte in the buffer, not the source. So therefore the line above should be this:

contentUnitLen = contentNext - contentUnit;

This is in the file ESP8266WebServer.cpp. I've created a pull request, #880, for this issue.

[igrr]

#880 merged, thank you!

[JohnSL]

Thank you!