Don't complain if we can't read /proc/self/task/pid/stack.

Why do we see the warning on every stack in an ANR? Because normally on
Android you either won't have CONFIG_STACKTRACE, or you won't have
PTRACE_MODE_ATTACH_FSCREDS. I'm assuming this code still has some value
on the host, so I'm just silencing the warning rather than deleting the
code.

Test: treehugger
Change-Id: I2f203bde87a6613d1b300a0020290c62bea4ac48
1 file changed