[3.10] 00462: Fix PySSL_SetError handling SSL_ERROR_SYSCALL #124
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Python 3.10 changed from using SSL_write() and SSL_read() to SSL_write_ex() and SSL_read_ex(), but did not update handling of the return value.
Change error handling so that the return value is not examined. OSError (not EOF) is now returned when retval is 0.
This resolves the issue of failing tests when a system is stressed on OpenSSL 3.5.