Simplify test syntax

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 83123af..17f7e2e 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -482,7 +482,7 @@
 
     # if the test uses DTLS but no custom proxy, add a simple proxy
     # as it provides timing info that's useful to debug failures
-    if [ "X$PXY_CMD" = "X" -a "$DTLS" -eq 1 ]; then
+    if [ -z "$PXY_CMD" ] && [ "$DTLS" -eq 1 ]; then
         PXY_CMD="$P_PXY"
     fi