test_dep_states test fails

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This issue was created by revision 2d532080822e.

When first device is idle, the second one states  "RF Transmission Error" 
instead of simply not found any available device.
Full cutter log here:

debug   libnfc.chip.pn53x       InJumpForDEP
debug   libnfc.chip.pn53x       Timeout values: 300
debug   libnfc.bus.uart TX: 00  00  ff  05  fb  d4  56  00  00  00  d6  00
debug   libnfc.bus.uart RX: 00  00  ff  00  ff  00
debug   libnfc.chip.pn53x       PN53x ACKed
debug   libnfc.bus.uart Timeout!
debug   libnfc.chip.pn53x       InJumpForDEP
debug   libnfc.chip.pn53x       Timeout values: 300
debug   libnfc.bus.uart TX: 00  00  ff  05  fb  d4  56  00  00  00  d6  00
debug   libnfc.bus.uart RX: 00  00  ff  00  ff  00
debug   libnfc.chip.pn53x       PN53x ACKed
debug   libnfc.bus.uart RX: 00  00  ff  03  fd
debug   libnfc.bus.uart RX: d5  57
debug   libnfc.bus.uart RX: 01
debug   libnfc.bus.uart RX: d3  00
debug   libnfc.chip.pn53x       Chip error: "Timeout" (01), returned error: "RF 
Transmission Error" (-20))
F
===============================================================================
Failure: test_dep_states
Problem with nfc_idle
<0 == res>
expected: <0>
  actual: <-20>

diff:
? -20

./test_device_modes_as_dep.c:171: initiator_thread(): cut_assert_equal_int(0, 
res, cut_test_context_set_current_result_user_message( 
cut_test_context_current_peek(), 
cut_test_context_take_printf(cut_test_context_current_peek(), "Problem with 
nfc_idle")))
===============================================================================

Original issue reported on code.google.com by romu...@libnfc.org on 18 Jan 2013 at 5:34