fstests: _require_chattr() must get an input arg

_require_chattr() was never intended to be called without an input
argument (specifiying the required attribute to set).

However, calling it without input arguments did work and error
was silently discarded into full test output.

Fix the function to abort on missing input argument and fix the
only test that called _require_chattr() with no input argument.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

common/rc

@@ -3134,18 +3134,21 @@ _require_test_lsattr()
 
 _require_chattr()
 {
-    attribute=$1
+	if [ -z "$1" ]; then
+		echo "Usage: _require_chattr <attr>"
+		exit 1
+	fi
+	local attribute=$1
 
-    touch $TEST_DIR/syscalltest
-    chattr "+$attribute" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
-    status=$?
-    chattr "-$attribute" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
-    if [ "$status" -ne 0 ]; then
-      _notrun "file system doesn't support chattr +$attribute"
-    fi
-    cat $TEST_DIR/syscalltest.out >> $seqres.full
-
-    rm -f $TEST_DIR/syscalltest.out
+	touch $TEST_DIR/syscalltest
+	chattr "+$attribute" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
+	status=$?
+	chattr "-$attribute" $TEST_DIR/syscalltest > $TEST_DIR/syscalltest.out 2>&1
+	if [ "$status" -ne 0 ]; then
+		_notrun "file system doesn't support chattr +$attribute"
+	fi
+	cat $TEST_DIR/syscalltest.out >> $seqres.full
+	rm -f $TEST_DIR/syscalltest.out
 }
 
 _get_total_inode()

tests/overlay/027

@@ -57,7 +57,7 @@ rm -f $seqres.full
 _supported_fs overlay
 _supported_os Linux
 _require_scratch
-_require_chattr
+_require_chattr i
 
 # Remove all files from previous tests
 _scratch_mkfs