Also remove an sprintf. Also fix various bits of code that were
reporting stale adb_error values when they meant strerror.
(cherry-pick of 078f0fcf4c63b8d8e8c10a18855eae04ca321e06.)
Bug: http://b/20666660
Change-Id: Ibeb48b7bc21bb0ec30ba47889d1d671ee480e1b7
I keep trying to clean things up and needing std::strings. Might as
well just do this now.
usb_linux_client.c is going to stay as C because GCC isn't smart
enough to deal with the designated initializers it uses (though for
some reason it is in C mode).
The Darwin files are staying as C because I don't have a way to test
that they build.
The Windows files are staying as C because while I can actually build
for them, it's slow and painful.
Change-Id: I75367d29205a9049d34460032b3bb36384f43941
