kill.c correctness

[pablo caballero]

"if (!*argv || *ep)" should be "if (!**argv || *ep)" but !**argv is
already granted by !isdigit(**argv)

Index: kill.c
===================================================================
RCS file: /cvs/src/bin/kill/kill.c,v
retrieving revision 1.9
diff -u -r1.9 kill.c
--- kill.c      27 Oct 2009 23:59:21 -0000      1.9
+++ kill.c      6 Jun 2011 04:18:54 -0000
@@ -65,7 +65,7 @@
                        if (!isdigit(**argv))
                                usage();
                        numsig = strtol(*argv, &ep, 10);
-                       if (!*argv || *ep)
+                       if (*ep)
                                errx(1, "illegal signal number: %s", *argv);
                        if (numsig >= 128)
                                numsig -= 128;