[reSIProcate] [resiprocate/resiprocate] log errno names instead of values (#47)

[Udit Raikwar]

> +/*EMEDIUMTYPE     124 */  "EMEDIUMTYPE (Wrong medium type)",
> +/*ECANCELED       125 */  "ECANCELED (Operation canceled)",
> +/*ENOKEY          126 */  "ENOKEY (Required key not available)",
> +/*EKEYEXPIRED     127 */  "EKEYEXPIRED (Key has expired)",
> +/*EKEYREVOKED     128 */  "EKEYREVOKED (Key has been revoked)",
> +/*EKEYREJECTED    129 */  "EKEYREJECTED (Key was rejected by service)",
> +/*EOWNERDEAD      130 */  "EOWNERDEAD (Owner died)",
> +/*ENOTRECOVERABLE 131 */  "ENOTRECOVERABLE (State not recoverable)",
> +/*ERFKILL         132 */  "ERFKILL (Operation not possible due to RF-kill)",
> +/*EHWPOISON       133 */  "EHWPOISON (Memory page has hardware error)",
> +};
> +static const int NUM_MESSAGES_OS = sizeof(messagesOS)/sizeof(messagesOS[0]);
> +
> +static inline char* errortostringOS(int errnumOS)
> +{
> +   if (errnumOS < NUM_MESSAGES_OS)

I made some changes to code 
```
static inline char* errortostringOS(int errnumOS)
{
   if ( (errnumOS >= 0 )  &&  (errnumOS < NUM_MESSAGES_OS))
      return messagesOS[errnumOS];
   return "Unknown error";
}
```
It is not possible for errnumOS to be negative, please read these two answers
[answer1](http://stackoverflow.com/a/25489728/4499919) [answer2](http://stackoverflow.com/a/18351359/4499919)

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