Implicit conversion of size_t to int in proto_utils.h causes conversion warnings

[bkietz]

#21827 switched from using the deprecated int MessageLite::ByteSize() to size_t MessageLite::ByteSizeLong(), but the variable this call is assigned to was left as int. This causes conversion warnings (when these are enabled) and even build failures (with -Werror, for example) in projects which #include this header.

Added an explicit to int.

@nicolasnoble

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Benjamin Kietzman (5aba343)

[bkietz]

@nicolasnoble I believe this doesn't warrant release notes but in any case I don't have the ability to add the labels required by Mergeable

[stale]

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