From 17450ddc1c8eebb366423889eafac89c37232ecb Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 27 Jan 2023 14:44:23 +0530
Subject: [PATCH] Silence spurious warning from gcc

---
 src/calibre/ebooks/djvu/bzzdecoder.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/djvu/bzzdecoder.c b/src/calibre/ebooks/djvu/bzzdecoder.c
index 5b4641e585..d74a8ddc02 100644
--- a/src/calibre/ebooks/djvu/bzzdecoder.c
+++ b/src/calibre/ebooks/djvu/bzzdecoder.c
@@ -655,12 +655,13 @@ bzz_decompress(PyObject *self, PyObject *args) {
 
         if (state.xsize > 0) {
             while (buflen - (pos - buf) <= state.xsize) {
+                size_t xpos = pos - buf;
                 tmp = (char*) realloc(buf, buflen + (buflen * sizeof(char)));
                 if (tmp == NULL) {
                     PyErr_NoMemory(); goto end;
                 }
                 buflen += buflen * sizeof(char);
-                pos = tmp + (pos - buf);
+                pos = tmp + xpos;
                 buf = tmp; tmp = NULL;
             }
             memcpy(pos, state.buf, state.xsize);