Fixed minor drawing problem of the on-screen KDL: in NO_CLEAN mode, the first two

lines would be left untouched instead of cleared before use.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13375 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/debug/blue_screen.cpp

@@ -71,7 +71,7 @@ next_line(void)
 	}
 
 #if NO_CLEAR
-	sModule->fill_glyph(0, sScreen.y + 2, sScreen.columns, 1, ' ', sScreen.attr);
+	sModule->fill_glyph(0, (sScreen.y + 2) % sScreen.rows, sScreen.columns, 1, ' ', sScreen.attr);
 #endif
 	sScreen.x = 0;
 }