malloc: Output region when debugging

When DEBUG is set, output memory region used for malloc().

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index d87834d..991229d 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1533,6 +1533,9 @@
 	mem_malloc_end = start + size;
 	mem_malloc_brk = start;
 
+	debug("using memory %#lx-%#lx for malloc()\n", mem_malloc_start,
+	      mem_malloc_end);
+
 	memset((void *)mem_malloc_start, 0, size);
 
 	malloc_bin_reloc();