skill: fix command line with signal, again

Application of master patch d1d2ccf

Original by Filipe Brandenburger <filbranden@google.com>

Signed-off-by: Craig Small <csmall@enc.com.au>

skill.c

@@ -418,10 +418,8 @@ static void parse_options(int argc,
         prino = snice_prio_option(&argc, argv);
     else if (program == PROG_SKILL) {
         signo = skill_sig_option(&argc, argv);
-        if (-1 < signo) {
+        if (-1 < signo)
             sig_or_pri = signo;
-            argc -= 1;
-        }
     }
 
     pid_count = 0;