Bug report

When checking if openssl_error_string() === false at some point in a function, the return type of openssl_error_string() is always considered false even if we call other openssl functions.

Code snippet that reproduces the problem

https://phpstan.org/r/7c7a055c-268d-47f6-aa9f-b6d113cba563

Expected output

In this above snippet, the openssl_error_string() call in the if does not return false but "error:0909006C:PEM routines:get_name:no start line" and PHPStan should not raise an error.

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