perf trace beauty mmap: Add missing MADV_FREE

tools/perf/trace/beauty/mmap.c forgets to check MADV_FREE.
This patch fixes it.

Signed-off-by: Wang Nan <[e-mail]>
Cc: Naveen N. Rao <[e-mail]>
Cc: Zefan Li <[e-mail]>
Cc: [e-mail]
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/trace/beauty/mmap.c

···
 	P_MADV_BHV(SEQUENTIAL);
 	P_MADV_BHV(WILLNEED);
 	P_MADV_BHV(DONTNEED);
+	P_MADV_BHV(FREE);
 	P_MADV_BHV(REMOVE);
 	P_MADV_BHV(DONTFORK);
 	P_MADV_BHV(DOFORK);