disable stdout in require_*_configs_* functions

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 0dd7fe6..659719c 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -234,28 +234,28 @@
 }
 
 requires_all_configs_enabled() {
-    if ! $P_QUERY -all $*
+    if ! $P_QUERY -all $* 2>&1 > /dev/null
     then
         SKIP_NEXT="YES"
     fi
 }
 
 requires_all_configs_disabled() {
-    if $P_QUERY -any $*
+    if $P_QUERY -any $* 2>&1 > /dev/null
     then
         SKIP_NEXT="YES"
     fi
 }
 
 requires_any_configs_enabled() {
-    if ! $P_QUERY -any $*
+    if ! $P_QUERY -any $* 2>&1 > /dev/null
     then
         SKIP_NEXT="YES"
     fi
 }
 
 requires_any_configs_disabled() {
-    if $P_QUERY -all $*
+    if $P_QUERY -all $* 2>&1 > /dev/null
     then
         SKIP_NEXT="YES"
     fi