Compiler warnings with 1.3.1

Just a heads-up that there are several compiler warnings when building
1.3.1. It appears there are some funky strlen calls in
check_snmp.c. For example:

check_snmp.c: In function 'check_snmp_virtualserver':
check_snmp.c:523:21: warning: passing argument 1 of 'strlen' from
incompatible pointer type [-Wincompatible-pointer-types]
   *var_len = strlen(v->quorum_up);
                     ^
In file included from ./../include/check_data.h:28:0,
                 from check_snmp.c:25:
/usr/include/string.h:394:15: note: expected 'const char *' but
argument is of type 'notify_script_t * {aka struct _notify_script *}'
 extern size_t strlen (const char *__s)
               ^~~~~~

I've not yet had time to figure out exactly what the intent here is,
but strlen of a notify_script_t struct is the problem. Does this need
to be a sizeof? My guess is the code here is supposed to determine the
size of the SNMP data, but I am not all that familiar with the SNMP
code.

Ryan


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