chpst: fix error check of nice(2) call

Check errno instead of return value because -1 is a valid return
value also on success.

Signed-off-by: Christian Franke <christian.franke@t-online.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/runit/chpst.c b/runit/chpst.c
index 2be1a5775..4e3d613b7 100644
--- a/runit/chpst.c
+++ b/runit/chpst.c
@@ -466,7 +466,8 @@ int chpst_main(int argc UNUSED_PARAM, char **argv)
         /* nice should be done before xsetuid */
         if (opt & OPT_n) {
                 errno = 0;
-                if (nice(xatoi(nicestr)) == -1)
+                nice(xatoi(nicestr));
+                if (errno)
                         bb_simple_perror_msg_and_die("nice");
         }