OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4

Commit ba02fa37 disabled the
venc driver registration on OMAP4. Since the driver never gets
probed/initialised your get a dereferenceed NULL pointer if you
try to get info from /sys/kernel/debug/omapdss/venc

Return info message about disabled venc if venc_dump_regs() gets called.
Signed-off-by: Danny Kukawka <danny.kukawka@bisect.de>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/venc.c

@@ -699,6 +699,11 @@ void venc_dump_regs(struct seq_file *s)
 {
 #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, venc_read_reg(r))
 
+	if (cpu_is_omap44xx()) {
+		seq_printf(s, "VENC currently disabled on OMAP44xx\n");
+		return;
+	}
+
 	if (venc_runtime_get())
 		return;