mac-address-set: add timeout to wait_on function

if a device is never getting ready on startup sequence, the wait_on()
function runs forever. with this patch it aborts after 10 seconds.

BugzID: 77171

Signed-off-by: Patrick Zysset <patrick.zysset@netmodule.com>

recipes-bsp/mac-address-set/files/mac-address-set.sh

@@ -66,8 +66,15 @@ wait_on() {
 	fi
 	log_info "$device not ready"
 	log_info "Waiting...."
+	wait_timeout=0
 	while ! $cmd "$device" > /dev/null 2>/dev/null; do
+		if [ $wait_timeout -gt 10 ]; then
+			log_warning "Timeout after 10 seconds, exiting now.."
+			break
+		else
 			sleep 1
+		fi
+		wait_timeout=$(($wait_timeout+1))
 	done
 	log_info "$device ready"
 }