allow dumping of all symbols to a signature file

*hopefully* fix the memleak when scrubbing wii discs.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4588 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/StringUtil.cpp

@@ -173,6 +173,7 @@ std::string StringFromFormat(const char* format, ...)
 
 	buf[writtenCount] = '\0';
 	std::string temp = buf;
+	delete[] buf;
 	return temp;
 }