fix sslexpiry func

Author: techgaun

.functions/sslcert

@@ -1,5 +1,9 @@
 sslexpiry() {
-  echo | openssl s_client -connect "${1}" 2> /dev/null | \
-  openssl x509 -noout -enddate | \
-  cut -d = -f 2
+  if [[ "x" == "${1}x" ]]; then
+    echo "Usage: ${0} <domain:port>"
+  else
+    echo | openssl s_client -connect "${1}" 2> /dev/null | \
+      openssl x509 -noout -enddate | \
+      cut -d = -f 2
+  fi
 }