mctp-ops: fix sysfs link-resolution check

We have the logic inverted when checking that the resolved
/sys/class/net/ path is within /sys.

Fixes: 3317571 ("mctpd: resolve sysfs paths for links")
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>

Author: jk-ozlabs

src/mctp-ops.c

@@ -70,7 +70,7 @@ static int mctp_op_link_sysfs_path(const char *ifname, char **path)
 		goto out;
 	}
 
-	if (!strncmp(dev_path, "/sys", strlen("/sys"))) {
+	if (strncmp(dev_path, "/sys", strlen("/sys"))) {
 		warnx("malformed interface path for %s", ifname);
 		goto out;
 	}