Silence false potential null pointer access warnings

Change-Id: I30c074a1b3436e47316b2eb2f083708161182d32

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java

@@ -533,6 +533,7 @@ public final class DfsPackFile {
 		return ByteBuffer.wrap(copyBuf, 0, bs);
 	}
 
+	@SuppressWarnings("null")
 	void copyAsIs(PackOutputStream out, DfsObjectToPack src,
 			boolean validate, DfsReader ctx) throws IOException,
 			StoredObjectRepresentationNotAvailableException {
@@ -836,6 +837,7 @@ public final class DfsPackFile {
 		return buf.position();
 	}
 
+	@SuppressWarnings("null")
 	ObjectLoader load(DfsReader ctx, long pos)
 			throws IOException {
 		try {