[erlang-patches] fix valgrind error in erts/emulator/drivers/unix/ttsl_drv.c

[Steve Vinoski]

On Linux I noticed the following complaint while doing some valgrind
testing:

==18040== Thread 6:
==18040== Source and destination overlap in memcpy(0xf3f3f04, 0xf3f3f08, 52)
==18040==    at 0x4C2CFA0: memcpy@@GLIBC_2.14 (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18040==    by 0x5CF527: del_chars (ttsl_drv.c:845)
==18040==    by 0x5CED5E: ttysl_from_erlang (ttsl_drv.c:658)
==18040==    by 0x4982E3: erts_write_to_port (io.c:1235)
==18040==    by 0x49A2BD: erts_port_command (io.c:2223)
==18040==    by 0x48C054: do_send (bif.c:1962)
==18040==    by 0x48CB6E: erl_send (bif.c:2162)
==18040==    by 0x566599: process_main (beam_emu.c:1665)
==18040==    by 0x4B1A95: sched_thread_func (erl_process.c:4834)
==18040==    by 0x6075E2: thr_wrapper (ethread.c:106)
==18040==    by 0x5560E99: start_thread (pthread_create.c:308)

This patch fixes the problem.

git fetch git://github.com/vinoski/otp.git sv-ttsl-valgrind

https://github.com/vinoski/otp/compare/erlang:maint...sv-ttsl-valgrind
https://github.com/vinoski/otp/compare/erlang:maint...sv-ttsl-valgrind.patch

--steve
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