fix: avoid using internal subroutine

PKGBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Oscar Wallberg <oscar.wallberg@outlook.com>
 pkgname=claude-code
 pkgver=2.1.196
-pkgrel=1
+pkgrel=2
 pkgdesc="Use Claude, Anthropic's AI assistant, right from your terminal"
 arch=('x86_64')
 url="https://claude.ai/code"
@@ -22,7 +22,7 @@ check() {
     local expected="$(jq -r '.platforms."linux-x64".checksum' "${pkgver}-manifest.json")"
     local actual="$(sha256sum "${pkgver}-claude" | cut -d' ' -f1)"
     if [[ "$actual" != "$expected" ]]; then
-        error "Binary checksum mismatch: got $actual, manifest has $expected"
+        echo "Binary checksum mismatch: got $actual, manifest has $expected" >&2
         return 1
     fi
 }