perf report: Fix HV bit mismerge

Fix:

 builtin-report.c: In function ‘hist_entry__add’:
 builtin-report.c:1015: error: case label not within a switch statement
 builtin-report.c:1017: error: break statement not within loop or switch

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>