gen_initramfs.sh: use gen_init_cpio -o parameter

gen_init_cpio can now write to a file directly, so use it when
gen_initramfs.sh is called with -o (e.g. usr/Makefile invocation).

Signed-off-by: David Disseldorp <[e-mail]>
Reviewed-by: Nicolas Schier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Nathan Chancellor <[e-mail]>

usr/gen_initramfs.sh

···
 dep_list=
 timestamp=
 cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
-output="/dev/stdout"
+# gen_init_cpio writes to stdout by default
+output=""
 
 trap "rm -f $cpio_list" EXIT
 
···
 			shift
 			;;
 		"-o")	# generate cpio image named $1
-			output="$1"
+			output="-o $1"
 			shift
 			;;
 		"-u")	# map $1 to uid=0 (root)
···
 
 # If output_file is set we will generate cpio archive
 # we are careful to delete tmp files
-usr/gen_init_cpio $timestamp $cpio_list > $output
+usr/gen_init_cpio $output $timestamp $cpio_list