get_human_readable_size() formats all negative numbers as if they were
small.

The previous two commits changed all callers to pass unsigned
arguments.  Change the parameter type to from int64_t to uint64_t.

Also change the buffer size parameter from int (ahem!) to size_t.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 block/qapi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/block/qapi.c b/block/qapi.c
index 1c6123c..0f6620e 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -566,10 +566,11 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
 
 #define NB_SUFFIXES 4
 
-static char *get_human_readable_size(char *buf, int buf_size, int64_t size)
+static char *get_human_readable_size(char *buf, size_t buf_size,
+                                     uint64_t size)
 {
     static const char suffixes[NB_SUFFIXES] = {'K', 'M', 'G', 'T'};
-    int64_t base;
+    uint64_t base;
     int i;
 
     if (size <= 999) {
-- 
2.7.5