Check for restart before buffering more reads in Icarus.

driver-icarus.c

@@ -358,13 +358,6 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 			return ICA_NONCE_TIMEOUT;
 		}
 
-		if (amt > 0) {
-			buf += amt;
-			read_amount -= amt;
-			first = false;
-			continue;
-		}
-
 		if (thr && thr->work_restart) {
 			if (opt_debug) {
 				applog(LOG_DEBUG,
@@ -372,6 +365,12 @@ static int icarus_get_nonce(struct cgpu_info *icarus, unsigned char *buf, struct
 			}
 			return ICA_NONCE_RESTART;
 		}
+
+		if (amt > 0) {
+			buf += amt;
+			read_amount -= amt;
+			first = false;
+		}
 	}
 }