debug/dwarf: return ErrUnknownPC rather than nil on unknown PC

Currently, on e == nil or e.Tag == 0, SeekPC returns with a nil error.
Instead, indicate that the PC is unknown.

Change-Id: I9594296034e2df872e399bd800b00cb565c413c9
Reviewed-by: Carlos Amedee <>
TryBot-Result: Gopher Robot <>
Reviewed-by: Ian Lance Taylor <>
Run-TryBot: Ian Lance Taylor <>
1 file changed
tree: b861a135d32f1e723eef5c6f72df8ef993873822
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  12. go.env

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