From da83fa8ab29ca2e624b9c2f312eacf9585a666f5 Mon Sep 17 00:00:00 2001
From: wangjianyu3 <wangjianyu3@xiaomi.com>
Date: Fri, 29 Mar 2024 20:30:43 +0800
Subject: [PATCH] tools/mksymtab.sh: Check sed expression

sed: -e expression #1, char 0: no previous regular expression

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
---
 tools/mksymtab.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/mksymtab.sh b/tools/mksymtab.sh
index a77604024..e72196791 100755
--- a/tools/mksymtab.sh
+++ b/tools/mksymtab.sh
@@ -53,7 +53,9 @@ if [ -z "$varlist" ]; then
 
 # Remove the intersection between them, and the remaining symbols are found in the main image
     common=`echo "$varlist" | tr ' ' '\n' | grep -Fxf <(echo "$deflist" | tr ' ' '\n') | tr '\n' ' '`
-    varlist=`echo $varlist | sed "s/$common//g"`
+    if [ "x$common" != "x" ]; then
+      varlist=`echo $varlist | sed "s/$common//g"`
+    fi
   fi
 fi