[PATCH blktests] Fix syntax error with bash v4.1.2(e.g RHEL6)

[xiao yang]

-v option is not supported by conditional expressions on
bash v4.1.2, so we use -n instead of -v to fix this issue.

Signed-off-by: xiao yang <yangx...@cn.fujitsu.com>
---
 check            | 12 ++++++------
 common/fio       |  2 +-
 common/rc        |  2 +-
 tests/meta/group |  4 ++--
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/check b/check
index 95d269a..7fbdc70 100755
--- a/check
+++ b/check
@@ -178,7 +178,7 @@ _output_status() {
        local test="$1"
        local status="$2"
 
-       if [[ -v DESCRIPTION ]]; then
+       if [[ -n $DESCRIPTION ]]; then
                printf '%-60s' "$test ($DESCRIPTION)"
        else
                printf '%-60s' "$test"
@@ -215,7 +215,7 @@ _output_notrun() {
 }
 
 _output_last_test_run() {
-       if [[ -v TEST_DEV ]]; then
+       if [[ -n $TEST_DEV ]]; then
                _output_status "$TEST_NAME => $(basename "$TEST_DEV")" ""
        else
                _output_status "$TEST_NAME" ""
@@ -240,7 +240,7 @@ _output_test_run() {
                tput cuu $((${#LAST_TEST_RUN[@]} - 3))
        fi
 
-       if [[ -v TEST_DEV ]]; then
+       if [[ -n $TEST_DEV ]]; then
                _output_status "$TEST_NAME => $(basename "$TEST_DEV")" 
"${TEST_RUN[status]}ed"
        else
                _output_status "$TEST_NAME" "${TEST_RUN[status]}ed"
@@ -270,7 +270,7 @@ _output_test_run() {
 }
 
 _cleanup() {
-       if [[ -v TMPDIR ]]; then
+       if [[ -n $TMPDIR ]]; then
                rm -rf "$TMPDIR"
                unset TMPDIR
        fi
@@ -282,7 +282,7 @@ _cleanup() {
                unset TEST_DEV_QUEUE_SAVED["$key"]
        done
 
-       if [[ -v RESTORE_CPUS_ONLINE ]]; then
+       if [[ -n $RESTORE_CPUS_ONLINE ]]; then
                local cpu
                for cpu in "${!CPUS_ONLINE_SAVED[@]}"; do
                        echo "${CPUS_ONLINE_SAVED["$cpu"]}" 
>"/sys/devices/system/cpu/cpu$cpu/online"
@@ -599,7 +599,7 @@ while true; do
        esac
 done
 
-if [[ QUICK_RUN -ne 0 && ! -v TIMEOUT ]]; then
+if [[ QUICK_RUN -ne 0 && ! -n $TIMEOUT ]]; then
        _error "QUICK_RUN specified without TIMEOUT"
 fi
 
diff --git a/common/fio b/common/fio
index f5787b4..eb21038 100644
--- a/common/fio
+++ b/common/fio
@@ -160,7 +160,7 @@ _fio_perf() {
 # You should usually use this instead of calling fio directly.
 _run_fio() {
        local args=("--output=$TMPDIR/fio_perf" "--output-format=terse" 
"--terse-version=4" "--group_reporting=1")
-       if [[ -v TIMEOUT ]]; then
+       if [[ -n $TIMEOUT ]]; then
                args+=("--runtime=$TIMEOUT")
        fi
        fio "${args[@]}" "$@"
diff --git a/common/rc b/common/rc
index 09ce4ef..0fdab99 100644
--- a/common/rc
+++ b/common/rc
@@ -35,7 +35,7 @@ _error() {
 # for TIMEOUT / number of subtests.
 _divide_timeout() {
        local num_tests="$1"
-       if [[ -v TIMEOUT ]]; then
+       if [[ -n $TIMEOUT ]]; then
                ((TIMEOUT = (TIMEOUT + num_tests - 1) / num_tests))
        fi
 }
diff --git a/tests/meta/group b/tests/meta/group
index 4281ea1..012a700 100644
--- a/tests/meta/group
+++ b/tests/meta/group
@@ -18,7 +18,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 group_requires() {
-       if [[ -v META_REQUIRES_SKIP ]]; then
+       if [[ -n $META_REQUIRES_SKIP ]]; then
                SKIP_REASON="META_REQUIRES_SKIP was set"
                return 1
        fi
@@ -26,7 +26,7 @@ group_requires() {
 }
 
 group_device_requires() {
-       if [[ -v META_DEVICE_REQUIRES_SKIP ]]; then
+       if [[ -n $META_DEVICE_REQUIRES_SKIP ]]; then
                SKIP_REASON="META_DEVICE_REQUIRES_SKIP was set"
                return 1
        fi
-- 
1.8.3.1