perf tools: Drop unneeded bitmap_zero() calls

bitmap_zero() is called after bitmap_alloc() in perf code. But
bitmap_alloc() internally uses calloc() which guarantees that allocated
area is zeroed. So following bitmap_zero is unneeded. Drop it.

This happened because of confusing name for bitmap allocator. It
should has name bitmap_zalloc instead of bitmap_alloc.

This series:

  https://lkml.org/lkml/2018/6/18/841

introduces a new API for bitmap allocations in kernel, and functions
there are named correctly. Following patch propogates the API to tools,
and fixes naming issue.

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andriy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: David Carrillo-Cisneros <davidcc@google.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Link: http://lkml.kernel.org/r/20180623073502.16321-1-ynorov@caviumnetworks.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/bitmap.c

@@ -16,8 +16,6 @@ static unsigned long *get_bitmap(const char *str, int nbits)
 	bm = bitmap_alloc(nbits);
 
 	if (map && bm) {
-		bitmap_zero(bm, nbits);
-
 		for (i = 0; i < map->nr; i++)
 			set_bit(map->map[i], bm);
 	}

tools/perf/tests/mem2node.c

@@ -24,8 +24,6 @@ static unsigned long *get_bitmap(const char *str, int nbits)
 	bm = bitmap_alloc(nbits);
 
 	if (map && bm) {
-		bitmap_zero(bm, nbits);
-
 		for (i = 0; i < map->nr; i++) {
 			set_bit(map->map[i], bm);
 		}

tools/perf/util/header.c

@@ -279,8 +279,6 @@ static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
 	if (!set)
 		return -ENOMEM;
 
-	bitmap_zero(set, size);
-
 	p = (u64 *) set;
 
 	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
@@ -1285,7 +1283,6 @@ static int memory_node__read(struct memory_node *n, unsigned long idx)
 		return -ENOMEM;
 	}
 
-	bitmap_zero(n->set, size);
 	n->node = idx;
 	n->size = size;