Add missing static qualifier in DiffFormatter

These methods do not touch instance members and can avoid the
implicit "this" argument.

Change-Id: I01c30bb22266eed1c9db18bdf9f90c1c1590e3ec
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffFormatter.java

@@ -633,7 +633,7 @@ public class DiffFormatter {
 		format(res.header, res.a, res.b);
 	}
 
-	private void writeGitLinkDiffText(OutputStream o, DiffEntry ent)
+	private static void writeGitLinkDiffText(OutputStream o, DiffEntry ent)
 			throws IOException {
 		if (ent.getOldMode() == GITLINK) {
 			o.write(encodeASCII("-Subproject commit " + ent.getOldId().name() //$NON-NLS-1$
@@ -757,7 +757,7 @@ public class DiffFormatter {
 		writeLine(' ', text, line);
 	}
 
-	private boolean isEndOfLineMissing(final RawText text, final int line) {
+	private static boolean isEndOfLineMissing(final RawText text, final int line) {
 		return line + 1 == text.size() && text.isMissingNewlineAtEnd();
 	}