Fx else if in lua

Change-Id: Idf02bf232e1e583c8417b8cfcdd8c53873d43ea6
diff --git a/heka/files/lua/decoders/apache_wsgi_log.lua b/heka/files/lua/decoders/apache_wsgi_log.lua
index 48a4524..05424ec 100644
--- a/heka/files/lua/decoders/apache_wsgi_log.lua
+++ b/heka/files/lua/decoders/apache_wsgi_log.lua
@@ -68,7 +68,7 @@
         end
         if m.http_x_forwarded_for and patt.ip_address:match(m.http_x_forwarded_for) then
             msg.Fields.http_client_ip_address = m.http_x_forwarded_for
-        else if m.remote_addr then
+        elseif m.remote_addr then
             msg.Fields.http_client_ip_address = m.remote_addr
         end