Bugfix: DevAPI: Make for_each_logical_proc work correctly

deviceapi.h

@@ -126,6 +126,6 @@ extern void close_device_fd(struct thr_info *);
 #define for_each_managed_proc(procvar, dev)  \
 	for (struct cgpu_info *procvar = dev; procvar; procvar = procvar->next_proc)
 #define for_each_logical_proc(procvar, dev)  \
-	for (struct cgpu_info *procvar = dev; procvar->proc_id < dev->procs; procvar = procvar->next_proc)
+	for (struct cgpu_info *procvar = dev; procvar && procvar->device == (dev); procvar = procvar->next_proc)
 
 #endif