ssl-opt.sh: Fix requires_config_value_exactly

Fix comparison bug in requires_config_value_exactly.
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 8136326..a39ca3e 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -210,7 +210,7 @@
         # Should never happen
         echo "Mbed TLS configuration $1 is not defined"
         exit 1
-    elif [ "$VAL" -eq "$2" ]; then
+    elif [ "$VAL" -ne "$2" ]; then
        SKIP_NEXT="YES"
     fi
 }