Initialized "cgmi_retries" variable from CustomInitContext with the same value as the other retries, moreover the context is now allocated with g_slice_new0. Before this changes, when cgmi_retries assumed big values during the probing of no AT-capable ports, the command AT+CGMI (mm-plugin-dell.c:custom_init_step) was sent a semi-infinite number of times, blocking the plugin's initialization.