From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 21 Dec 2019 18:18:05 +0000 (+0200)
Subject: ;* src/process.c (read_process_output): Fix last change.
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;* src/process.c (read_process_output): Fix last change.
---

diff --git a/src/process.c b/src/process.c
index d6a0b30f7cb..35f6e3b548f 100644
--- a/src/process.c
+++ b/src/process.c
@@ -6095,7 +6095,10 @@ read_process_output (Lisp_Object proc, int channel)
   if (nbytes <= 0)
     {
       if (nbytes < 0 || coding->mode & CODING_MODE_LAST_BLOCK)
-	return SAFE_FREE_UNBIND_TO (count, nbytes);
+	{
+	  SAFE_FREE_UNBIND_TO (count, Qnil);
+	  return nbytes;
+	}
       coding->mode |= CODING_MODE_LAST_BLOCK;
     }