SR: Fix issues Coverity found:
Issue 1: ``` /src/or/shared_random_state.c: 639 in disk_state_update() 633 next = &(line->next); 634 } 635 if (sr_state->current_srv != NULL) { 636 *next = line = tor_malloc_zero(sizeof(*line)); 637 line->key = tor_strdup(dstate_cur_srv_key); 638 disk_state_put_srv_line(sr_state->current_srv, line); >>> CID 1362985: Code maintainability issues (UNUSED_VALUE) >>> Assigning value from "&line->next" to "next" here, but that stored value is overwritten before it can be used. 639 next = &(line->next); 640 } 641 642 /* Parse the commits and construct config line(s). */ 643 next = &sr_disk_state->Commit; 644 DIGESTMAP_FOREACH(sr_state->commits, key, sr_commit_t *, commit) { ``` Issue 2: ``` *** CID 1362984: Memory - corruptions (OVERRUN) /src/test/test_shared_random.c: 943 in test_utils() 937 const char *payload = 938 "\x5d\xb9\x60\xb6\xcc\x51\x68\x52\x31\xd9\x88\x88\x71\x71\xe0\x30" 939 "\x59\x55\x7f\xcd\x61\xc0\x4b\x05\xb8\xcd\xc1\x48\xe9\xcd\x16\x1f" 940 "\x70\x15\x0c\xfc\xd3\x1a\x75\xd0\x93\x6c\xc4\xe0\x5c\xbe\xe2\x18" 941 "\xc7\xaf\x72\xb6\x7c\x9b\x52"; 942 sr_commit_t commit1, commit2; >>> CID 1362984: Memory - corruptions (OVERRUN) >>> Overrunning buffer pointed to by "payload" of 56 bytes by passing it to a function which accesses it at byte offset 56 using argument "57UL". [Note: The source code implementation of the function has been overridden by a builtin model.] 943 memcpy(commit1.encoded_commit, payload, sizeof(commit1.encoded_commit)); 944 memcpy(commit2.encoded_commit, payload, sizeof(commit2.encoded_commit)); 945 tt_int_op(commitments_are_the_same(&commit1, &commit2), ==, 1); 946 /* Let's corrupt one of them. */ 947 memset(commit1.encoded_commit, 'A', sizeof(commit1.encoded_commit)); 948 tt_int_op(commitments_are_the_same(&commit1, &commit2), ==, 0); ```
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