EVP_CipherFinal_ex for snmpd

[David Gwynne]

this gets rid of a linker warning.

the impression i get is that EVP_CipherFinal_ex explicitely does
not do cleanup of the cipher context thing, while EVP_CipherFinal
could if it wanted to.

ok?

Index: usm.c
===================================================================
RCS file: /cvs/src/usr.sbin/snmpd/usm.c,v
retrieving revision 1.9
diff -u -p -r1.9 usm.c
--- usm.c       16 Jan 2015 00:05:13 -0000      1.9
+++ usm.c       2 Oct 2016 05:32:03 -0000
@@ -605,7 +605,7 @@ usm_crypt(struct snmp_message *msg, u_ch
                EVP_CIPHER_CTX_set_padding(&ctx, 0);
 
        if (EVP_CipherUpdate(&ctx, outbuf, &len, inbuf, inlen) &&
-           EVP_CipherFinal(&ctx, outbuf + len, &len2))
+           EVP_CipherFinal_ex(&ctx, outbuf + len, &len2))
                rv = len + len2;
        else
                rv = -1;