jpeg compressor: fix VC++ warning C4703

This commit fixes VC++ warning C4703 in jpeg-compressor/jpgd.cpp
"potentially uninitialized local pointer variable".
core: fix VC++ warning C4703

This commit fixes VC++ warning C4703 in core/remote_access.cpp
"potentially uninitialized local pointer variable".
Merge pull request #52 from zerhacken/vs2013-compiler-warnings

vs2013 compiler warnings