btrfs-progs: properly test for send_stream_version

We want to notrun if this test fails, not if it succeeds.  Additionally
we want -s, as -q will still print an error if it gets ENOENT from the
file we're trying to grep.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

tests/misc-tests/053-receive-write-encoded/test.sh

@@ -11,7 +11,7 @@ check_prereq btrfs
 setup_root_helper
 prepare_test_dev
 
-if grep -q '1$'  "/sys/fs/btrfs/features/send_stream_version"; then
+if ! grep -s '1$'  "/sys/fs/btrfs/features/send_stream_version"; then
 	_not_run "kernel does not support send stream >1"
 	exit
 fi