Fixed getAbsoluteFilename under Linux in case the file does not exist. Did...

Fixed getAbsoluteFilename under Linux in case the file does not exist. Did simply return an empty string, now it returns the original filename.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1685 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CFileSystem.cpp

@@ -218,6 +218,8 @@ core::stringc CFileSystem::getAbsolutePath(const core::stringc& filename) const
 #elif (defined(_IRR_POSIX_API_) || defined(_IRR_OSX_PLATFORM_))
 	c8 fpath[4096];
 	p = realpath(filename.c_str(), fpath);
+	if (!p)
+		return filename;
 #endif
 
 	return core::stringc(p);