[findbugs] Fix illegal format specifier

For integral arguments the precision is not applicable, would cause a
runtime exception when executed, see
http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax

Change-Id: I4738c64c1153a8d4ef5430e15d0fe54f0a37949f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>