kobject_add failed for usb_storage with -EEXIST, don't try to register things with the same name in the same directory.
 [<c03e86f7>] kobject_shadow_add+0x117/0x1a0
 [<c013fba4>] mod_sysfs_setup+0x24/0xb0
 [<c0141458>] sys_init_module+0x1648/0x1940
 [<c0102ae8>] syscall_call+0x7/0xb
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