xf86-video-savage: fix EXA UploadToScreen()

[Alex Villacís Lasso]

i r stupid

The sample replacement loop I sent before was incorrect after all. I was 
incrementing
the pointer srcp (which is of type CARD32*) by an amount of src_pitch 
(which is
in bytes). Duh. No wonder pixmaps appeared squished.

Attached is a fixed patch which properly removes the EXA breakage. 
However, I am
still looking for a reference of commands available through BCI. Window 
dragging
is awfully slow, even with EXA fixed, and I wonder what EXA operations 
should be
accelerated in order to fix this. An interesting observation: under EXA, 
using xcompmgr
for simple composition actually makes window dragging *faster* than 
without it.

Changelog:
* EXA upload to screen must honor pitch of the source data

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