Vendor string for FSF added.

FossilOrigin-Name: 784ea8c14b320fd8970e5f8580a166fe630144d31747daf9d49efe271ed8a59a

src/capwap/cw_ianavendoridtostr.c

@@ -6,6 +6,8 @@ const char * cw_ianavendoridtostr(int id){
 	switch(id){
 		case 890:
 			return "ZyXEL Communications Corp.";
+		case 11591:
+			return "Free Software Foundation";
 		default:
 			return "Unknown";
 	}