initialize kernel_pid_t correctly

boards/avsextrem/drivers/avsextrem-smb380.c

boards/msb-430-common/uart1.c

boards/msba2-common/drivers/msba2-uart0.c

boards/redbee-econotag/drivers/redbee_uart1.c

boards/redbee-econotag/drivers/redbee_uart2.c

boards/telosb/uart.c

boards/wsn430-common/wsn430-uart0.c

boards/z1/uart.c

cpu/cc430/cc430-rtc.c

cpu/native/net/interface.c

cpu/x86/x86_rtc.c

examples/ccn-lite-client/main.c

examples/ccn-lite-relay/main.c

sys/net/ccn_lite/ccnl-ext-appserver.c

sys/net/network_layer/sixlowpan/border/border.c

sys/net/network_layer/sixlowpan/border/flowcontrol.c

sys/net/routing/rpl/rpl.c

sys/net/routing/rpl/trickle.c

sys/net/transport_layer/destiny/tcp.c

sys/posix/pthread/pthread.c