[openssl.org #2050] [PATCH] Fix handling of ENOTCONN and EMSGSIZE for dgram bios

[Michael Tuexen via RT]

Dear all,

the attached patch fixes the handling of error cases:
* For dgram bios use always BIO_dgram_should_retry() instead
   of BIO_scok_should_retry().
* ENOTCONN is a fatal error.
* EMSGSIZE is a fatal error, not related to path MTU.

Thanks to Daniel Mentz, who pointed out the incorrect error
handling when testing with the DTLS/SCTP implementation.

Best regards
Michael

errno.patch
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