[patch] rebound: add NULL pointer checks

[Clemens Goessnitzer]

This patch adds 2 missing NULL pointer checks to rebound.c after malloc().

Clemens

Index: rebound.c
===================================================================
RCS file: /cvs/src/usr.sbin/rebound/rebound.c,v
retrieving revision 1.98
diff -u -p -r1.98 rebound.c
--- rebound.c   1 May 2018 15:14:43 -0000       1.98
+++ rebound.c   7 Sep 2018 19:12:13 -0000
@@ -643,6 +643,8 @@ preloadcache(const char *name, uint16_t 
        /* header + len + name + type + class */
        reqlen = sizeof(*req) + 1 + strlen(name) + 2 + 2;
        req = malloc(reqlen);
+       if (req == NULL)
+               return;
 
        req->id = 0;
        req->flags = htons(0x100);
@@ -661,6 +663,9 @@ preloadcache(const char *name, uint16_t 
        /* req + name (compressed) + type + class + ttl + len + data */
        resplen = reqlen + 2 + 2 + 2 + 4 + 2 + rdatalen;
        resp = malloc(resplen);
+       if (resp == NULL)
+               return;
+
        memcpy(resp, req, reqlen);
        resp->flags = htons(0x100 | 0x8000);    /* response */
        resp->ancount = htons(1);