Fix bindings container log test

[Luap99]

What this PR does / why we need it:

The returned error was not checked, thus the test could hang forever
since it blocks on the log channel.

How to verify it

Which issue(s) this PR fixes:

Fixes #12176

Special notes for your reviewer:

[openshift-ci]

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[edsantiago]

Tested on f35, works very nicely:

# ginkgo -trace -debug -r -v -focus logging
...
• Failure [3.653 seconds]
Podman containers
/root/podman/pkg/bindings/test/containers_test.go:18
  logging [It]
  /root/podman/pkg/bindings/test/containers_test.go:356

  Unexpected error:
      <*errors.withStack | 0xc0004ba960>: {
          error: <*errors.withMessage | 0xc0004ee340>{
              cause: <*errors.fundamental | 0xc0000f6048>{
                  msg: "lost synchronization with multiplexed stream",
                  stack: [0xefc569, 0x4534cc, 0x453452, 0x453452, 0x4456c5, 0x47d1e1],
              },
              msg: "channel \"123\" found, 0-3 supported",
          },
          stack: [0xef4025, 0xef902f, 0xf975de, 0x47d1e1],
      }
      channel "123" found, 0-3 supported: lost synchronization with multiplexed stream
  occurred

  /root/podman/pkg/bindings/test/containers_test.go:374
...

[mheon]

/lgtm