[FB]: Fix uninitialized fb_cmap member in sbuslib.c

When handling FBIOPUTCMAP_SPARC, sbusfb fails to initialize cmap.transp,
which quickly leads to an oops when fb_set_cmap() dereferences it.

First encountered in Aurora Wombat kernels and seems to afflict mainline
as well. Patch is against 2.6.7-rc2. xorg still fails to actually get
anything to display on my CG6, but at least it no longer oopses the kernel.
Signed-off-by: Adam Kropelin <akropel1@rochester.rr.com>
Signed-off-by: David S. Miller <davem@redhat.com>

drivers/video/sbuslib.c

@@ -122,6 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
 		cmap.red = &red;
 		cmap.green = &green;
 		cmap.blue = &blue;
+		cmap.transp = NULL;
 		for (i = 0; i < count; i++) {
 			int err;