fixup

Author: mattiaswal

utils/kernel-upgrade.sh

@@ -263,7 +263,9 @@ update_changelog() {
         log_info "Updated existing kernel version entry to $NEW_VERSION"
     else
         # Add new kernel upgrade entry after first "### Changes"
-        sed -i "0,/^### Changes/a\\
+        # Find line number of first "### Changes" and insert after it
+        LINE_NUM=$(grep -n "^### Changes" doc/ChangeLog.md | head -1 | cut -d: -f1)
+        sed -i "${LINE_NUM}a\\
 - Upgrade Linux kernel to $NEW_VERSION (LTS)" doc/ChangeLog.md
         log_info "Added new kernel version entry: $NEW_VERSION"
     fi