Remove a stray WARNING left in deltafile.cc
Remove a stray WARNING left in deltafile.cc

This was a debugging warning that I accidentally left in when fixing
8d377ac0fe2be0f9176526e9db745ea6dd70ce86.

Change-Id: I5492ddeafa54f0fe5f02a190fecab5e61c3c856b
Reviewed-on: http://gerrit.cloudera.org:8080/3211
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>
Tested-by: Kudu Jenkins

InspurUSA/kudu,helifu/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,cloudera/kudu,andrwng/kudu,andrwng/kudu,helifu/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,cloudera/kudu,andrwng/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,helifu/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,cloudera/kudu,helifu/kudu,helifu/kudu,andrwng/kudu,InspurUSA/kudu,InspurUSA/kudu,cloudera/kudu,andrwng/kudu,EvilMcJerkface/kudu,cloudera/kudu,EvilMcJerkface/kudu,andrwng/kudu,cloudera/kudu,andrwng/kudu,helifu/kudu,andrwng/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,cloudera/kudu,andrwng/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,EvilMcJerkface/kudu,InspurUSA/kudu