[findBugs] Silence DM_STRING_CTOR on PacketLineIn

We don't want to pool this String.

Change-Id: I68bb1c57fac2e138eece4503ca5bda8f69261083
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/findBugs/FindBugsExcludeFilter.xml

@@ -38,4 +38,12 @@
        <Class name="org.eclipse.jgit.util.TemporaryBuffer$BlockInputStream" />
        <Bug pattern="UR_UNINIT_READ" />
      </Match>
+
+	<!-- Silence invoke inefficient String constructor, we do not want to pool
+		here -->
+     <Match>
+       <Class name="org.eclipse.jgit.transport.PacketLineIn" />
+       <Method name="&lt;clinit&gt;" />
+       <Bug pattern="DM_STRING_CTOR" />
+     </Match>
 </FindBugsFilter>