Update bson/src/main/org/bson/io/BasicOutputBuffer.java

Co-authored-by: Viacheslav Babanin <frest0512@gmail.com>

Author: Edarke

bson/src/main/org/bson/io/BasicOutputBuffer.java

@@ -209,7 +209,7 @@ private void checkPosition(final int absolutePosition, final int bytesToWrite) {
             throw new IllegalArgumentException(format("position must be >= 0 but was %d", absolutePosition));
         }
         if (absolutePosition > buffer.position() - bytesToWrite) {
-            throw new IllegalArgumentException(format("position must be <= %d but was %d", buffer.position() - 1, absolutePosition));
+            throw new IllegalArgumentException(format("position must be <= %d but was %d", buffer.position() - bytesToWrite, absolutePosition));
         }
     }
 }