Remove redundant size checks, and document that width, height must be > 0.

Remove redundant size checks, and document that width, height must be > 0.

2006-12-21  Matthias Clasen  <mclasen@redhat.com>

        * gdk-pixbuf-data.c (gdk_pixbuf_new_from_data):
        * gdk-pixbuf.c (gdk_pixbuf_new): Remove redundant size
        checks, and document that width, height must be > 0.
        (#343330, Felix Riemann)