fix WOLFSSL_CALLBACK memory error #6949
Merged
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make checkfrom passing when used withWOLFSSL_CALLBACKS. When invoking the example server withWOLFSSL_CALLBACKSdefined and using either the-6option (simulated WANT_WRITE errors) or-u(DTLS), the server will hang inrecv()because the socket isn't set as non-blocking. To reproduce, run./configure --enable-all CFLAGS="-DWOLFSSL_CALLBACKS" && make checkonmaster.