[PATCH 2/3] Revert "selftests: firmware: remove use of non-standard diff -Z option"

["Luis R. Rodriguez" <mcgrof@kernel.org>]

From: Luis Chamberlain <mcgrof@kernel.org>

This reverts commit f70b472e937bb659a7b7a14e64f07308e230888c.

This breaks testing on Debian, and this patch was NACKed anyway.
The proper way to address this is a quirk for busybox as that is
where the issue is present.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 tools/testing/selftests/firmware/fw_filesystem.sh | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/firmware/fw_filesystem.sh b/tools/testing/selftests/firmware/fw_filesystem.sh
index 466cf2f91ba0..a4320c4b44dc 100755
--- a/tools/testing/selftests/firmware/fw_filesystem.sh
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -155,8 +155,11 @@ read_firmwares()
 {
 	for i in $(seq 0 3); do
 		config_set_read_fw_idx $i
-		# Verify the contents match
-		if ! diff -q "$FW" $DIR/read_firmware 2>/dev/null ; then
+		# Verify the contents are what we expect.
+		# -Z required for now -- check for yourself, md5sum
+		# on $FW and DIR/read_firmware will yield the same. Even
+		# cmp agrees, so something is off.
+		if ! diff -q -Z "$FW" $DIR/read_firmware 2>/dev/null ; then
 			echo "request #$i: firmware was not loaded" >&2
 			exit 1
 		fi
@@ -168,7 +171,7 @@ read_firmwares_expect_nofile()
 	for i in $(seq 0 3); do
 		config_set_read_fw_idx $i
 		# Ensures contents differ
-		if diff -q "$FW" $DIR/read_firmware 2>/dev/null ; then
+		if diff -q -Z "$FW" $DIR/read_firmware 2>/dev/null ; then
 			echo "request $i: file was not expected to match" >&2
 			exit 1
 		fi
-- 
2.18.0