bug: isicom: kobject_add failed for ttyM0 with -EEXIST

[Ingo Molnar <mingo@elte.hu>]

allyesconfig bzImage bootup produced 33 warning messages, of which the 
first couple are attached below.

	Ingo

--------------->
Calling initcall 0xc0628d59: isicom_setup+0x0/0x315()
kobject_add failed for ttyM0 with -EEXIST, don't try to register things with the same name in the same directory.
 [<c0106273>] show_trace_log_lvl+0x34/0x4a
 [<c01063a9>] show_trace+0x2c/0x2e
 [<c01063d6>] dump_stack+0x2b/0x2d
 [<c04f06a3>] kobject_add+0x15f/0x187
 [<c06e3421>] class_device_add+0xb5/0x45c
 [<c06e37e5>] class_device_register+0x1d/0x21
 [<c06e3892>] class_device_create+0xa9/0xcc
 [<c05f8a5c>] tty_register_device+0xe3/0xea
 [<c05f97fa>] tty_register_driver+0x202/0x21e
 [<c0628fa3>] isicom_setup+0x24a/0x315
 [<c0100567>] init+0x178/0x451
 [<c0105feb>] kernel_thread_helper+0x7/0x10
 =======================
kobject_add failed for ttyM1 with -EEXIST, don't try to register things with the same name in the same directory.
 [<c0106273>] show_trace_log_lvl+0x34/0x4a
 [<c01063a9>] show_trace+0x2c/0x2e
 [<c01063d6>] dump_stack+0x2b/0x2d
 [<c04f06a3>] kobject_add+0x15f/0x187
 [<c06e3421>] class_device_add+0xb5/0x45c
 [<c06e37e5>] class_device_register+0x1d/0x21
 [<c06e3892>] class_device_create+0xa9/0xcc
 [<c05f8a5c>] tty_register_device+0xe3/0xea
 [<c05f97fa>] tty_register_driver+0x202/0x21e
 [<c0628fa3>] isicom_setup+0x24a/0x315
 [<c0100567>] init+0x178/0x451
 [<c0105feb>] kernel_thread_helper+0x7/0x10
 =======================
kobject_add failed for ttyM2 with -EEXIST, don't try to register things with the same name in the same directory.
 [<c0106273>] show_trace_log_lvl+0x34/0x4a
 [<c01063a9>] show_trace+0x2c/0x2e
 [<c01063d6>] dump_stack+0x2b/0x2d
 [<c04f06a3>] kobject_add+0x15f/0x187
 [<c06e3421>] class_device_add+0xb5/0x45c
 [<c06e37e5>] class_device_register+0x1d/0x21
 [<c06e3892>] class_device_create+0xa9/0xcc
 [<c05f8a5c>] tty_register_device+0xe3/0xea
 [<c05f97fa>] tty_register_driver+0x202/0x21e
 [<c0628fa3>] isicom_setup+0x24a/0x315
 [<c0100567>] init+0x178/0x451
 [<c0105feb>] kernel_thread_helper+0x7/0x10
 =======================
kobject_add failed for ttyM3 with -EEXIST, don't try to register things with the same name in the same directory.
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