rs: Fix various harmless warnings.

- Add /* FALLTHROUGH */ comments for intentional fall throughs in
  getargs().

- Remove id strings to quiet -Wunused-const-variable warnings from
  GCC.

- While here, remove __FBSDID.

Reviewed by:	brooks
Differential Revision:	https://reviews.freebsd.org/D36830

usr.bin/rs/rs.c

@@ -29,25 +29,12 @@
  * SUCH DAMAGE.
  */
 
-#ifndef lint
-static const char copyright[] =
-"@(#) Copyright (c) 1993\n\
-	The Regents of the University of California.  All rights reserved.\n";
-#endif /* not lint */
-
-#ifndef lint
-static const char sccsid[] = "@(#)rs.c	8.1 (Berkeley) 6/6/93";
-#endif /* not lint */
-
 /*
  *	rs - reshape a data array
  *	Author:  John Kunze, Office of Comp. Affairs, UCB
  *		BEWARE: lots of unfinished edges
  */
 
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
 #include <err.h>
 #include <ctype.h>
 #include <limits.h>
@@ -402,11 +389,13 @@ getargs(int ac, char *av[])
 			switch (*p) {
 			case 'T':
 				flags |= MTRANSPOSE;
+				/* FALLTHROUGH */
 			case 't':
 				flags |= TRANSPOSE;
 				break;
 			case 'c':		/* input col. separator */
 				flags |= ONEISEPONLY;
+				/* FALLTHROUGH */
 			case 's':		/* one or more allowed */
 				if (p[1])
 					isep = *++p;
@@ -415,6 +404,7 @@ getargs(int ac, char *av[])
 				break;
 			case 'C':
 				flags |= ONEOSEPONLY;
+				/* FALLTHROUGH */
 			case 'S':
 				if (p[1])
 					osep = *++p;
@@ -428,6 +418,7 @@ getargs(int ac, char *av[])
 				break;
 			case 'K':			/* skip N lines */
 				flags |= SKIPPRINT;
+				/* FALLTHROUGH */
 			case 'k':			/* skip, do not print */
 				p = getnum(&skip, p, 0);
 				if (!skip)
@@ -459,6 +450,7 @@ getargs(int ac, char *av[])
 				break;
 			case 'H':			/* print shape only */
 				flags |= DETAILSHAPE;
+				/* FALLTHROUGH */
 			case 'h':
 				flags |= SHAPEONLY;
 				break;
@@ -485,14 +477,19 @@ getargs(int ac, char *av[])
 	/*if (!osep)
 		osep = isep;*/
 	switch (ac) {
-	/*case 3:
-		opages = atoi(av[2]);*/
+#if 0
+	case 3:
+		opages = atoi(av[2]);
+		/* FALLTHROUGH */
+#endif
 	case 2:
 		if ((ocols = atoi(av[1])) < 0)
 			ocols = 0;
+		/* FALLTHROUGH */
 	case 1:
 		if ((orows = atoi(av[0])) < 0)
 			orows = 0;
+		/* FALLTHROUGH */
 	case 0:
 		break;
 	default: