time(1): kill some NOTREACHEDs

[Scott Cheloha]

style(9) says these can go.

--
Scott Cheloha

Index: usr.bin/time/time.c
===================================================================
RCS file: /cvs/src/usr.bin/time/time.c,v
retrieving revision 1.22
diff -u -p -r1.22 time.c
--- usr.bin/time/time.c 13 Jul 2017 06:39:54 -0000      1.22
+++ usr.bin/time/time.c 14 Jul 2017 00:16:39 -0000
@@ -69,10 +69,8 @@ main(int argc, char *argv[])
                        break;
                default:
                        usage();
-                       /* NOTREACHED */
                }
        }
-
        argc -= optind;
        argv += optind;
 
@@ -84,12 +82,10 @@ main(int argc, char *argv[])
        case -1:                        /* error */
                perror("time");
                exit(1);
-               /* NOTREACHED */
        case 0:                         /* child */
                execvp(*argv, argv);
                perror(*argv);
                _exit((errno == ENOENT) ? 127 : 126);
-               /* NOTREACHED */
        }
 
        /* parent */