correctly pass chunkedpassthrough err to messagesplitter

Author: NickOvt

lib/mail-parser.js

@@ -165,8 +165,8 @@ class MailParser extends Transform {
 
         this.decoder = this.getDecoder();
 
-        this.chunkedPassthrough.on('error', () => {
-            this.splitter.emit('error');
+        this.chunkedPassthrough.on('error', err => {
+            this.splitter.emit('error', err);
         });
 
         this.splitter.on('readable', () => {