Fix opendir error condition checks

Thanks to Laszlo Papp <djszapi@archlinux.us> for the following catch:
  opendir(path)) == (DIR *)-1;
is maybe the result of misunderstanding the manpage. If an opendir() call
isn't successful it returns NULL rather than '(DIR *)-1'.

Noticed-by: Laszlo Papp <djszapi@archlinux.us>
Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 082c095b..2b006e21 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -404,7 +404,8 @@ int _alpm_rmrf(const char *path)
 				}
 			}
 		} else {
-			if((dirp = opendir(path)) == (DIR *)-1) {
+			dirp = opendir(path);
+			if(!dirp) {
 				return(1);
 			}
 			for(dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {