selftests: splice_read: Fix sysfs read cases

sysfs now supports splice_* operations with

commit f2d6c2708bd84 ("kernfs: wire up ->splice_read and ->splice_write")

Update the selftests to expect success instead of failure.

Cc: Shuah Khan <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Cc: Siddharth Gupta <[e-mail]
Reported-by: Dilip Kota <[e-mail]>
Signed-off-by: Suzuki K Poulose <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/splice/short_splice_read.sh

···
 if ! [ -d /sys/module/test_module/sections ] ; then
 	expect_success "test_module kernel module load" modprobe test_module
 fi
-expect_failure "kernfs attr splice" test_splice /sys/module/test_module/coresize
-expect_failure "kernfs binattr splice" test_splice /sys/module/test_module/sections/.init.text
+expect_success "kernfs attr splice" test_splice /sys/module/test_module/coresize
+expect_success "kernfs binattr splice" test_splice /sys/module/test_module/sections/.init.text
 
 exit $ret