gh-156745: Inline CJK replacement writer call (gh-156744)

Modules/cjkcodecs/multibytecodec.c

diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 32c96c9..d909004 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -429,8 +429,8 @@ multibytecodec_decerror(const MultibyteCodec *codec,
     }
 
     if (errors == ERROR_REPLACE) {
-        if (_PyUnicodeWriter_WriteChar(&buf->writer,
-                                       Py_UNICODE_REPLACEMENT_CHARACTER) < 0)
+        if (_PyUnicodeWriter_WriteCharInline(
+                &buf->writer, Py_UNICODE_REPLACEMENT_CHARACTER) < 0)
             goto errorexit;
     }
     if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {