IOP HLE: Set pos to 0 on invalid handles during sstave save.

pcsx2/IopBios.cpp

@@ -1463,7 +1463,11 @@ bool SaveStateBase::handleFreeze()
 			//save the current file position
 			const u32 fd = R3000A::handles[i].fd_index;
 			IOManFile* file = R3000A::ioman::getfd<IOManFile>(fd + firstfd);
-			s32 pos = file->lseek(0, SEEK_CUR);
+			s32 pos;
+
+			// Some files may have never existed, but we still need to save their handle
+			// UlaunchELF 4.4 can do this with LAUNCHELF.CNF	
+			pos = file ? file->lseek(0, SEEK_CUR) : 0;
 			Freeze(pos);
 
 			//save the parameters for opening the file