Land rapid7#2703, uninit const fix for MSSQL_SQLI

Author: wvu

lib/msf/core/exploit/mssql_sqli.rb

@@ -144,7 +144,7 @@ def mssql_query(sqla, doprint=false)
     if (datastore['METHOD'] == 'GET')
 
       unless datastore['GET_PATH'].index("[SQLi]")
-        fail_with(Failure::NoTarget, "The SQL injection parameter was not specified in the GET path")
+        fail_with(::Msf::Module::Failure::NoTarget, "The SQL injection parameter was not specified in the GET path")
       end
 
       uri = datastore['GET_PATH'].gsub("[SQLi]", Rex::Text.uri_encode(sqla))
@@ -160,7 +160,7 @@ def mssql_query(sqla, doprint=false)
     else
 
       unless datastore['DATA'].index("[SQLi]")
-        fail_with(Failure::NoTarget, "The SQL injection parameter was not specified in the POST data")
+        fail_with(::Msf::Module::Failure::NoTarget, "The SQL injection parameter was not specified in the POST data")
       end
 
       post_data = datastore['DATA'].gsub("[SQLi]", Rex::Text.uri_encode(sqla))