Address reports by Coverity in updated OpenSSL code !5385

** CID 340808:  Control flow issues  (DEADCODE)
/lib/dns/openssldh_link.c: 1209 in openssldh_parse()


________________________________________________________________________________________________________
*** CID 340808:  Control flow issues  (DEADCODE)
/lib/dns/openssldh_link.c: 1209 in openssldh_parse()
1203     	key->key_size = (unsigned int)key_size;
1204     	ret = ISC_R_SUCCESS;
1205     
1206     err:
1207     #if OPENSSL_VERSION_NUMBER < 0x30000000L
1208     	if (dh != NULL) {
   CID 340808:  Control flow issues  (DEADCODE)
   Execution cannot reach this statement: "DH_free(dh);".
1209     		DH_free(dh);
1210     	}
1211     #else
1212     	if (pkey != NULL) {
1213     		EVP_PKEY_free(pkey);
1214     	}

** CID 340807:    (OVERRUN)
/lib/dns/opensslrsa_link.c: 931 in opensslrsa_tofile()
/lib/dns/opensslrsa_link.c: 930 in opensslrsa_tofile()
/lib/dns/opensslrsa_link.c: 931 in opensslrsa_tofile()


________________________________________________________________________________________________________
*** CID 340807:    (OVERRUN)
/lib/dns/opensslrsa_link.c: 931 in opensslrsa_tofile()
925     	priv.nelements = i;
926     	ret = dst__privstruct_writefile(key, &priv, directory);
927     
928     err:
929     	while (i--) {
930     		if (bufs[i] != NULL) {
   CID 340807:    (OVERRUN)
   Overrunning array "bufs" of 8 8-byte elements at element index 9 (byte offset 79) using index "i" (which evaluates to 9).
931     			isc_mem_put(key->mctx, bufs[i],
932     				    priv.elements[i].length);
933     		}
934     	}
935     #if OPENSSL_VERSION_NUMBER < 0x30000000L
936     	RSA_free(rsa);
/lib/dns/opensslrsa_link.c: 930 in opensslrsa_tofile()
924     
925     	priv.nelements = i;
926     	ret = dst__privstruct_writefile(key, &priv, directory);
927     
928     err:
929     	while (i--) {
   CID 340807:    (OVERRUN)
   Overrunning array "bufs" of 8 8-byte elements at element index 9 (byte offset 79) using index "i" (which evaluates to 9).
930     		if (bufs[i] != NULL) {
931     			isc_mem_put(key->mctx, bufs[i],
932     				    priv.elements[i].length);
933     		}
934     	}
935     #if OPENSSL_VERSION_NUMBER < 0x30000000L
/lib/dns/opensslrsa_link.c: 931 in opensslrsa_tofile()
925     	priv.nelements = i;
926     	ret = dst__privstruct_writefile(key, &priv, directory);
927     
928     err:
929     	while (i--) {
930     		if (bufs[i] != NULL) {
   CID 340807:    (OVERRUN)
   Overrunning array "bufs" of 8 8-byte elements at element index 9 (byte offset 79) using index "i" (which evaluates to 9).
931     			isc_mem_put(key->mctx, bufs[i],
932     				    priv.elements[i].length);
933     		}
934     	}
935     #if OPENSSL_VERSION_NUMBER < 0x30000000L
936     	RSA_free(rsa);