[z2346] Get rid of warning in stdsoap2.cpp pull request #33
warning C4244: 'return' : conversion from 'std::streamsize' to 'size_t',
possible loss of data.
Since n is from type size_t that got converted to std::streamsize
gcount() can never be greater that the max value of size_t.

Signed-off-by: Salja <salja2012@hotmail.de>