Fixed bug GH-12020: intl_get_error_message() broken after MessageFormatter::formatMessage() fails

Passing NULL as the pointer to intl_error* will use the global error stack.
This is what

Fixed bug GH-12020: intl_get_error_message() broken after MessageFormatter::formatMessage() fails

Passing NULL as the pointer to intl_error* will use the global error stack.
This is what we need to do instead of pushing it onto the temporary format object that is released.

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ext/intl: Fix memory leak in MessageFormatter::format()

Closes GH-11658