Silence boxing warning

Change-Id: I36c40eb91ce0c51f89b47911fa14beffcbc0a7cd
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/util/FS_POSIX.java

@@ -99,6 +99,7 @@ public class FS_POSIX extends FS {
 		}
 	}
 
+	@SuppressWarnings("boxing")
 	private void determineAtomicFileCreationSupport() {
 		// @TODO: enhance SystemReader to support this without copying code
 		Boolean ret = getAtomicFileCreationSupportOption(