patch 7.4.1446

Problem:    Crash when using json_decode().
Solution:   Terminate string with a NUL byte.

src/json.c

@@ -659,6 +659,7 @@ json_decode_string(js_read_T *reader, typval_T *res)
 	++reader->js_used;
 	if (res != NULL)
 	{
+	    ga_append(&ga, NUL);
 	    res->v_type = VAR_STRING;
 #if defined(FEAT_MBYTE) && defined(USE_ICONV)
 	    if (!enc_utf8)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1446,
 /**/
     1445,
 /**/