I don't think we're actually likely to hit this limit but if we do
then the comparison should be done as size_t.  The original code
is equivalent to:
        len = strlen(sptr) % USHRT_MAX;
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
                                const char *sptr = va_arg(ap, const char *);
                                uint16_t len = 0;
                                if (sptr)
-                                       len = min_t(uint16_t, strlen(sptr),
+                                       len = min_t(size_t, strlen(sptr),
                                                                USHRT_MAX);
 
                                errcode = p9pdu_writef(pdu, proto_version,