tegra: sysupgrade: remove check for number of arguments

This chunk got mistakenly removed from 30c95c4, since the get_image_dd
evaluates only first agument, so that check is useless.

Fixes: 30c95c4 ("tegra: sysupgrade: use get_image_dd wrapper")
Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
(cherry picked from commit 16815704fc)

target/linux/tegra/base-files/lib/upgrade/platform.sh

@@ -8,8 +8,6 @@ get_magic_at() {
 platform_check_image() {
 	local diskdev partdev diff
 
-	[ "$#" -gt 1 ] && return 1
-
 	case "$(get_magic_at "$1" 510)" in
 		55aa) ;;
 		*)