trivial: '3' is a magic number.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1459188 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/fileupload/util/mime/Base64Decoder.java b/src/main/java/org/apache/commons/fileupload/util/mime/Base64Decoder.java
index da819f0..1179ca3 100644
--- a/src/main/java/org/apache/commons/fileupload/util/mime/Base64Decoder.java
+++ b/src/main/java/org/apache/commons/fileupload/util/mime/Base64Decoder.java
@@ -122,11 +122,13 @@
                     // CHECKSTYLE IGNORE MagicNumber FOR NEXT 1 LINE
                     out.write((cache[1] << 4) | (cache[2] >> 2)); // 4 bits of b2 plus 4 bits of b3
                     outLen++;
+                    // CHECKSTYLE IGNORE MagicNumber FOR NEXT 1 LINE
                     if (cache[3] != PAD_BYTE) {
                         // CHECKSTYLE IGNORE MagicNumber FOR NEXT 1 LINE
                         out.write((cache[2] << 6) | cache[3]);        // 2 bits of b3 plus 6 bits of b4
                         outLen++;
                     }
+                // CHECKSTYLE IGNORE MagicNumber FOR NEXT 1 LINE
                 } else if (cache[3] != PAD_BYTE) { // if byte 3 is pad, byte 4 must be pad too
                     throw new IOException("Invalid Base64 input: incorrect padding");
                 }