fixed bug in DEBUG_LEVEL code

funcs/filtrage.c

@@ -17,7 +17,7 @@ float		*M;			/* alias of filter matrix */
 double		dval;
 
 #if DEBUG_LEVEL
-fprintf(stderr, ">>> %s ( %p %p %p)\n", __func__, s, d, filtr);
+fprintf(stderr, ">>> %s ( %p %p %p)\n", __func__, src, dst, filtr);
 #endif
 
 /*	aliasing some vars for cleaner code */