Decode C strings into Python strings (iovisor#1847)

Leftover from iovisor#986.

tools/profile.py

@@ -304,7 +304,7 @@ def aksym(addr):
  # print folded stack output
  user_stack = list(user_stack)
  kernel_stack = list(kernel_stack)
- line = [k.name.decode()]
+ line = [k.name]
  # if we failed to get the stack is, such as due to no space (-ENOMEM) or
  # hash collision (-EEXIST), we still print a placeholder for consistency
  if not args.kernel_stacks_only:
@@ -318,7 +318,7 @@ def aksym(addr):
  line.append("[Missed Kernel Stack]")
  else:
  line.extend([b.ksym(addr) for addr in reversed(kernel_stack)])
- print("%s %d" % (";".join(line), v.value))
+ print("%s %d" % (b";".join(line).decode(), v.value))
  else:
  # print default multi-line stack output
  if not args.user_stacks_only:
@@ -334,7 +334,7 @@ def aksym(addr):
  print(" [Missed User Stack]")
  else:
  for addr in user_stack:
- print(" %s" % b.sym(addr, k.pid))
+ print(" %s" % b.sym(addr, k.pid).decode())
  print(" %-16s %s (%d)" % ("-", k.name.decode(), k.pid))
  print(" %d\n" % v.value)