[fidl][go] use safeReadUint instead of readUint.

This CL changes the behavior of the `readUint` and `readInt` functions.
These functions used to call `safeReadUint` and then panic if an error
was found. That behavior is undesired for the fidl parsers.

The `readUint` function was replaced by `safeReadUint`, and the
`readInt` function calls `safeReadUint` and returns an error instead of
panicking.

I changed all the calls to `readUint` and `readInt` so they now handle
the extra possible returned error.

TEST=`fx run-test go_fidl_test`
NET-2032 #Done
Change-Id: I9fb5a6a1e5fb4aafa5185554b51caa113dd519e4

Change-Id: Iddad2313b74c6fd26cdc13420c19c46cf3cca1d7
3 files changed
tree: 693cc5f8c86031f96fc176c4f9ac4c322c7446c7
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD.gn
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. favicon.ico
  15. LICENSE
  16. makefuchsia.go
  17. makeroot.go
  18. PATENTS
  19. README.md
  20. regen-fidl
  21. robots.txt
  22. VERSION
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