Remove superfluous comment from DMRaid::lookup_dmraid_members()

Utils::trim_trailing_new_line() name is self-explanatory and doesn't
require a comment.  The comment became superfluous with commit:

    1fbc8988ff
    Extract repeated code into trim_trailing_new_line() (!105)

src/DMRaid.cc

@@ -569,7 +569,6 @@ std::vector<Glib::ustring> DMRaid::lookup_dmraid_members(const Glib::ustring& ar
 	Glib::ustring error;
 	Utils::execute_command("udevadm info --query=name " + Glib::shell_quote(array),
 	                       output, error, true);
-	// Strip terminating new line from output.
 	output = Utils::trim_trailing_new_line(output);
 
 	if (output.empty())