gst/videoscale/videoscale.c: Fix the scaling algorithm and avoid a buffer overflow...

gst/videoscale/videoscale.c: Fix the scaling algorithm and avoid a buffer overflow. removed the while loop in the sca...

Original commit message from CVS:
* gst/videoscale/videoscale.c: (gst_videoscale_scale_nearest),
(gst_videoscale_scale_nearest_str2),
(gst_videoscale_scale_nearest_str4),
(gst_videoscale_scale_nearest_32bit),
(gst_videoscale_scale_nearest_24bit),
(gst_videoscale_scale_nearest_16bit):
Fix the scaling algorithm and avoid a buffer overflow.
removed the while loop in the scaling function as it
was used for point sampling only.