[PCMCIA] Don't add CIS cache entries on failure.

If we fail to map the CIS space, don't pollute the CIS cache with
invalid data.

drivers/pcmcia/cistpl.c

@@ -293,6 +293,7 @@ static void read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
 #endif
 	ret = read_cis_mem(s, attr, addr, len, ptr);
 
+	if (ret == 0) {
 		/* Copy data into the cache */
 		cis = kmalloc(sizeof(struct cis_cache_entry) + len, GFP_KERNEL);
 		if (cis) {
@@ -302,6 +303,7 @@ static void read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
 			memcpy(cis->cache, ptr, len);
 			list_add(&cis->node, &s->cis_cache);
 		}
+	}
 }
 
 static void