Missing cast from reference to pointer

[SebastianSchildt]

OS X/clang build failed with

Logger.cpp:169:8: error: cannot cast from type 'std::ostream' (aka 'basic_ostream') to pointer type 'void '
if ((void)stream == (void_)output.stream)
^~~~~~~~~~~~~
Logger.cpp:169:25: error: cannot cast from type 'std::ostream' (aka 'basic_ostream') to pointer type 'void *'
if ((void)stream == (void*)output._stream)
^~~~~~~~~~~~~~~~~~~~~

because stream and LoggerOutput._stream are references. Need an & operator before casting

[morgenroth]

Please prefix all commits dedicated to the ibrcommon library with the key-word: "ibrcommon".
E.g. instead of "Missing cast from reference to pointer" set "ibrcommon: Missing cast from reference to pointer" as commit title.

[coveralls]

Coverage remained the same when pulling f77a864 on SebastianSchildt:osxcompilefix into 89a8285 on ibrdtn:master.

[coveralls]

Coverage increased (+0.02%) when pulling 3029811 on SebastianSchildt:osxcompilefix into 89a8285 on ibrdtn:master.