Fix-up cursor.
 [rsc] --rw-rw-r-- M 222375 glenda sys 12023 Jan  4 14:43 sys/src/9/pc/vganvidia.c
	/n/sourcesdump/2006/0104/plan9/sys/src/9/pc/vganvidia.c:184,190 - 
	/n/sourcesdump/2006/0105/plan9/sys/src/9/pc/vganvidia.c:184,199
	  		p = (void*)((uchar*)scr->mmio + Pramin + 0x1E00 * 4);
	  		break;
	  	default:
	- 		p = (void*)((uchar*)scr->vaddr + scr->storage - 96*1024);
	+ 		/*
	+ 		 * Reset the cursor location, since the kernel may
	+ 		 * have allocated less storage than aux/vga
	+ 		 * expected.
	+ 		 */
	+ 		tmp = scr->storage - 96*1024;
	+ 		p = (void*)((uchar*)scr->vaddr + tmp);
	+ 		vgaxo(Crtx, 0x30, 0x80|(tmp>>17));
	+ 		vgaxo(Crtx, 0x31, (tmp>>11)<<2);
	+ 		vgaxo(Crtx, 0x2F, tmp>>24);
	  		break;
	  	}