Closed a file pointer leak with CUE file interpretation. Coverity CID 21821.

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2015.10.26.145941"
+#define Cdrskin_timestamP "2015.10.26.150529"

libburn/structure.c

@@ -2155,6 +2155,8 @@ ex:
 	cue_crs_destroy(&crs, 0);
 	BURN_FREE_MEM(line);
 	BURN_FREE_MEM(msg);
+	if (fp != NULL)
+		fclose(fp);
 	return ret;
 }