[master] 0aa0836 Use strncmp to avoid potential overruns

[Federico G. Schwindt]

commit 0aa08363a015a2f2add8b258823d736bcb579b92
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Tue Aug 15 09:29:42 2017 +0100

    Use strncmp to avoid potential overruns

diff --git a/lib/libvarnishapi/vjsn.c b/lib/libvarnishapi/vjsn.c
index 10a8faf..c4d2254 100644
--- a/lib/libvarnishapi/vjsn.c
+++ b/lib/libvarnishapi/vjsn.c
@@ -373,15 +373,15 @@ vjsn_value(struct vjsn *js)
 		AN(jsv->value);
 		return (jsv);
 	}
-	if (!memcmp(js->ptr, "true", 4)) {
+	if (!strncmp(js->ptr, "true", 4)) {
 		js->ptr += 4;
 		return (vjsn_val_new(VJSN_TRUE));
 	}
-	if (!memcmp(js->ptr, "false", 5)) {
+	if (!strncmp(js->ptr, "false", 5)) {
 		js->ptr += 5;
 		return (vjsn_val_new(VJSN_FALSE));
 	}
-	if (!memcmp(js->ptr, "null", 4)) {
+	if (!strncmp(js->ptr, "null", 4)) {
 		js->ptr += 4;
 		return (vjsn_val_new(VJSN_NULL));
 	}