Fixed exception handling to use smb::proto

Author: Royce Davis

lib/msf/core/exploit/psexec.rb

@@ -180,7 +180,7 @@ def cleanup_after
 				file_rm(file)
 				print_good("#{peer} - Deleted #{file}")
 			end
-		rescue ::Exception => cleanup_error
+		rescue Rex::Proto::SMB::Exceptions::ErrorCode => cleanup_error
 			print_error("#{peer} - Unable to delte #{file}. #{cleanup_error}")
 		end
 	end