about 20 findbugs fixes all over

apps/i2psnark/java/src/org/klomp/snark/Snark.java

apps/i2psnark/java/src/org/klomp/snark/SnarkManager.java

apps/i2psnark/java/src/org/klomp/snark/bencode/BDecoder.java

apps/i2psnark/java/src/org/klomp/snark/web/BasicServlet.java

apps/i2psnark/java/src/org/klomp/snark/web/FetchAndAdd.java

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/irc/IRCFilter.java

...rconsole/java/src/net/i2p/router/web/ConfigNetHelper.java

...usimail/src/src/org/mortbay/servlet/MultiPartRequest.java

...java/src/freenet/support/CPUInformation/CPUIDCPUInfo.java

core/java/src/net/i2p/data/DataHelper.java

core/java/src/net/i2p/util/SipHashInline.java

core/java/src/net/i2p/util/ZipFileComment.java

core/java/src/net/metanotion/io/block/index/BSkipSpan.java

router/java/src/net/i2p/router/Blocklist.java

router/java/src/net/i2p/router/transport/GeoIPv6.java

router/java/src/net/i2p/router/transport/UPnP.java