Fixed some valgrind warnings.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@523 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/StringUtil.cpp

@@ -165,6 +165,11 @@ void StringFromFormatV(std::string* out, const char* format, va_list args)
 		delete [] buf;
 		buf = new char[newSize + 1];
 		writtenCount = vsnprintf(buf, newSize, format, args);
+		// ARGH! vsnprintf does no longer return -1 on truncation in newer libc!
+		// WORKAROUND! let's fake the old behaviour (even though it's less efficient).
+		// TODO: figure out why the fix causes an invalid read in strlen called from vsnprintf :(
+		if (writtenCount >= (int)newSize)
+			writtenCount = -1;
 		newSize *= 2;
 	}