runqemu-internal: Fixes unary operator expected in new TCPSERIAL_PORTNUM

If $TCPSERIAL_PORTNUM is empty string causes an error because
expands the expresion to,

$TCPSERIAL_PORTNUM == "" -> == ""

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
index baf53f3e8bcd39e3e5395ef9909d0fa79cd7159b..a691a80a466e1b74d3d519a92af00fe07d020154 100755 (executable)
--- a/scripts/runqemu-internal
+++ b/scripts/runqemu-internal
@@ -620,7 +620,7 @@ if [ "x$QEMUOPTIONS" = "x" ]; then
     return 1
 fi
 
-if [ $TCPSERIAL_PORTNUM != "" ]; then
+if [ "$TCPSERIAL_PORTNUM" != "" ]; then
     if [ "$MACHINE" = "qemuarm64" ]; then
         SCRIPT_QEMU_EXTRA_OPT="$SCRIPT_QEMU_EXTRA_OPT -device virtio-serial-device -chardev socket,id=virtcon,port=$TCPSERIAL_PORTNUM,host=127.0.0.1 -device virtconsole,chardev=virtcon"
     else