fix videoscale stride bugs

Original commit message from CVS:
fix videoscale stride bugs

ChangeLog

+2004-07-26  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* gst/videoscale/videoscale.c: (gst_videoscale_setup),
+	(gst_videoscale_planar411), (gst_videoscale_planar400),
+	(gst_videoscale_packed422), (gst_videoscale_packed422rev),
+	(gst_videoscale_scale_nearest_str1),
+	(gst_videoscale_scale_nearest_str2),
+	(gst_videoscale_scale_nearest_str4),
+	(gst_videoscale_scale_nearest_16bit),
+	(gst_videoscale_scale_nearest_24bit):
+	  fixed stride issues
+	  tested with 320x240 -> 321, 322, 324 x240
+	  tested with YV12, I420, YUY2, UYVY
+	  fixed packed422rev (don't think it could have worked before)
+	  by testing with UYVY
+
 2004-07-26  Benjamin Otte  <otte@gnome.org>
 
 	* ext/lame/gstlame.c: (gst_lame_sink_link), (gst_lame_init),