Use mgapcimatch in mga4xxdrawinit, this removes a handful of duplicated lines and detects MGA200 properly.

Notes:
Sat Aug 12 02:12:13 EDT 2006 rsc
    As far as I can tell, your patch does the
    opposite of your description.
    The code already used mgapcimatch
    and your patch would undo that.
    


Reference: /n/sources/patch/sorry/vgamga4xx-use-mgapcimatch
Date: Thu Jul 20 05:38:55 CES 2006
Signed-off-by: uriel@cat-v.org
Reviewed-by: rsc

--- /sys/src/9/pc/vgamga4xx.c	Thu Jul 20 05:37:16 2006
+++ /sys/src/9/pc/vgamga4xx.c	Thu Jul 20 05:37:12 2006
@@ -467,9 +467,11 @@
 	uchar *mga;
  	Pcidev *p;
 
-	p = mgapcimatch();
-	if(p->did == MGA200)
-		return;
+	p = pcimatch(nil, MATROX, MGA4xx);
+	if(p == nil)
+		p = pcimatch(nil, MATROX, MGA550);
+	if(p == nil)
+		return ;
 
 	if(scr->mmio == 0)
 		return;