change the type of popcount unsigned

it's a natural choice and compatible with a version found in NetBSD libc.

Signed-off-by: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/util.h b/lib/util.h
index b944ec79..4f6a2016 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -265,7 +265,7 @@ ctz(uint32_t n)
 
 int log_2_floor(uint32_t);
 int log_2_ceil(uint32_t);
-int popcount(uint32_t);
+unsigned int popcount(uint32_t);
 
 /* Returns the rightmost 1-bit in 'x' (e.g. 01011000 => 00001000), or 0 if 'x'
  * is 0. */