[Toybox] [PATCH] fix ionice

[enh]

Fix ionice.

ioprio_set takes a "prio" argument that combines class and level. Although
bionic (via the uapi headers) includes the appropriate constants and even a
convenience macro, glibc doesn't, so just hard-code the encoding.

Also fix the sense of a conditional so we actually execute the provided
command.

diff --git a/toys/other/ionice.c b/toys/other/ionice.c
index 82f8fde..e44270a 100644
--- a/toys/other/ionice.c
+++ b/toys/other/ionice.c
@@ -52,7 +52,9 @@ static int ioprio_get(void)

 static int ioprio_set(void)
 {
-  return syscall(__NR_ioprio_set, 1, (int)TT.pid, (int)TT.class,
(int)TT.level);
+  int prio = ((int)TT.class << 13) | (int)TT.level;
+
+  return syscall(__NR_ioprio_set, 1, (int)TT.pid, prio);
 }

 void ionice_main(void)
@@ -65,7 +67,7 @@ void ionice_main(void)
       p&7);
   } else {
     if (-1 == ioprio_set() && !(toys.optflags&FLAG_t)) perror_exit("set");
-    if (TT.pid) xexec(toys.optargs);
+    if (!TT.pid) xexec(toys.optargs);
   }
 }
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