um: fix ptrace build error

um: fix ptrace build error

Both commits dfa7122e3b9f ("ptrace: cleanup arch_ptrace() on um") and
c8254e7f1bd9 ("ptrace: change signature of arch_ptrace()") broke the um
build.  This patch fixes the issues.

dfa7122e3b9f introduced the undeclared variable "datavp".  The patch seems
completely untested.  :-(

c8254e7f1bd9 changed arch_ptrace()'s signature but did not update
um/include/asm/ptrace-generic.h.

Signed-off-by: Richard Weinberger <richard@nod.at>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Tested-by: Will Newton <will.newton@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>