fix source_address param

Author: jvazquez-r7

modules/exploits/windows/misc/ibm_director_cim_dllinject.rb

@@ -277,7 +277,7 @@ def exploit
 		basename = rand_text_alpha(3)
 		share_name = rand_text_alpha(3)
 
-		myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']
+		myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address : datastore['SRVHOST']
 
 		exploit_unc  = "\\\\#{myhost}\\"