restore original module RHOST on abort

lib/msf/ui/console/command_dispatcher/exploit.rb

@@ -48,12 +48,15 @@ class Exploit
   end
 
   def exploit_single(opts, rhost = nil)
+    orig_rhost = mod.datastore['RHOST']
     begin
-      mod.datastore['RHOST'] = rhost if rhost
+      mod.datastore['RHOST'] = rhost if orig_rhost
       session = mod.exploit_simple(opts)
     rescue ::Interrupt
+      mod.datastore['RHOST'] = orig_rhost
       raise $!
     rescue ::Exception => e
+      mod.datastore['RHOST'] = orig_rhost
       print_error("Exploit exception (#{mod.refname}): #{e.class} #{e}")
       if e.class.to_s != 'Msf::OptionValidateError'
         print_error("Call stack:")
@@ -97,6 +100,7 @@ class Exploit
         end
       end
     end
+    mod.datastore['RHOST'] = orig_rhost
   end
 
   def cmd_exploit_tabs(str, words)