FreeBSD compilation warnings

[benrubson]

Hello,

I get these warnings compiling the module under FreeBSD 10.2 / Apache 2.4.16_1.

# make
/usr/local/sbin/apxs -lmemcache -L/usr/local/lib/  -c mod_auth_memcookie.c
/usr/local/share/apr/build-1/libtool --silent --mode=compile cc -prefer-pic -O2 -pipe -I/usr/include -DLIBICONV_PLUG -fstack-protector -fno-strict-aliasing    -I/usr/local/include/apache24  -I/usr/local/include/apr-1   -I/usr/local/include/apr-1 -I/usr/include -I/usr/local/include -I/usr/local/include/db5  -c -o mod_auth_memcookie.lo mod_auth_memcookie.c && touch mod_auth_memcookie.slo
mod_auth_memcookie.c:266:54: warning: missing sentinel in function call [-Wsentinel]
    szMyGroups=apr_pstrcat(r->pool,":",szGroups,":",0);
                                                     ^
                                                     , NULL
/usr/local/include/apr-1/apr_strings.h:147:28: note: function has been explicitly marked sentinel here
APR_DECLARE_NONSTD(char *) apr_pstrcat(apr_pool_t *p, ...)
                           ^
mod_auth_memcookie.c:267:52: warning: missing sentinel in function call [-Wsentinel]
    szMyGroup=apr_pstrcat(r->pool,":",szGroup,":",0);
                                                   ^
                                                   , NULL
/usr/local/include/apr-1/apr_strings.h:147:28: note: function has been explicitly marked sentinel here
APR_DECLARE_NONSTD(char *) apr_pstrcat(apr_pool_t *p, ...)
                           ^
2 warnings generated.
/usr/local/share/apr/build-1/libtool --silent --mode=link cc -L/usr/lib -fstack-protector   -o mod_auth_memcookie.la  -L/usr/local/lib/ -lmemcache -rpath /usr/local/libexec/apache24 -module -avoid-version    mod_auth_memcookie.lo

Could they be corrected ?

Thank you !

Ben