Remove throws IOException declaration on filterClean

This method only creates an EolCanonicalizingInputStream
which does not throw an IOException and so the throws
declaration on the method is unneeded.

Change-Id: Icae8b80006c5e3ffcf3b69790a1a45c505be0f05
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java

@@ -412,7 +412,7 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 		}
 	}
 
-	private InputStream filterClean(InputStream in) throws IOException {
+	private InputStream filterClean(InputStream in) {
 		return new EolCanonicalizingInputStream(in, true);
 	}