connection_impl: Use early returns to reduce nested code in connection_impl.cc (#17275)
connection_impl: Use early returns to reduce nested code in connection_impl.cc (#17275)

connection_impl: Use early returns to reduce nested code in connection_impl.cc

No code change, just refactoring.

Risk Level: Low
Testing: N/A - no code change
Docs Changes: N/A
Release Notes: N/A
Platform Specific Features: N/A

Signed-off-by: Ryan Hamilton <178a6b23c07ff05a8c9baf34b89a84f7f1925657@google.com>
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