Fix some nonsense came from LGTM (#9962)
1. Local variable 's' hides a parameter of the same name.
```
int anetTcpAccept(char *err, int s, char *ip, size_t ip_len, int *port) {
if ((fd = anetGenericAccept(err,s,(struct sockaddr*)&sa,&salen)) == ANET_ERR){}
}
```
Change the parameter name from `s` to `serversock`,
also unified with the header file definition.
2. Comparison is always false because i <= 48.
```
for (i = 0; i < DICT_STATS_VECTLEN-1; i++) { // i < 49
(i == DICT_STATS_VECTLEN-1)?">= ":"", // i == 49
}
```
`i == DICT_STATS_VECTLEN-1` always result false, it is a dead code.
3. Empty block without comment.
`else if (!strcasecmp(opt,"ch")) {}`, add a comment to avoid warnings.
4. Bit field fill of type int should have explicitly unsigned integral, explicitly signed integral, or enumeration type.
Modify `int fill: QL_FILL_BITS;` to `unsigned int fill: QL_FILL_BITS;`
5. The result of this call to reconnectingRedisCommand is not checked for null, but 80% of calls to reconnectingRedisCommand check for null.
Just a cleanup job like others.
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