Merge lp://staging/~sforshee/powerd/fix-warnings into lp://staging/powerd

Unmerged revisions

98. By Seth Forshee on 2013-10-01

powerd-object: Fix tabs/space indentation in previous commit

97. By Seth Forshee on 2013-10-01

powerd-object: Fix warning about format string

Something changed recently to cause gcc to start warning about
some code that it had no problem with previously:

 src/powerd-object.c: In function 'handle_ack_state_change':
 src/powerd-object.c:131:47: warning: format not a string literal and no format arguments [-Wformat-security]
                                                G_DBUS_ERROR_INVALID_ARGS, msg);
                                                ^

This is probably just gcc being pedantic. Change it to something
which is completely equivalent but does not generate warnings.

96. By Seth Forshee on 2013-10-01

display: Make power_mode argument to display_set_power_mode() const

This fixes a warning:

 powerd.cpp: In function 'gboolean {anonymous}::call_shutdown(gpointer)':
 powerd.cpp:127:40: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

The argument is read-only, so it really ought to be const anyway.