Replace various spellings with FALLTHROUGH which is lint()able

bin/ed/main.c

@@ -355,7 +355,7 @@ next_addr(void)
 				addr = addr_last;
 				break;
 			}
-			/* FALL THROUGH */
+			/* FALLTHROUGH */
 		default:
 			if (ibufp == hd)
 				return EOF;
@@ -489,7 +489,7 @@ exec_command(void)
 	case 'e':
 		if (modified && !scripted)
 			return EMOD;
-		/* fall through */
+		/* FALLTHROUGH */
 	case 'E':
 		if (addr_cnt > 0) {
 			errmsg = "unexpected address";

bin/ls/ls.c

@@ -565,36 +565,36 @@ display(FTSENT *p, FTSENT *list)
 		switch (ninitmax) {
 		case 0:
 			maxinode = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 1:
 			maxblock = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 2:
 			maxnlink = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 3:
 			maxuser = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 4:
 			maxgroup = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 5:
 			maxflags = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 6:
 			maxsize = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 7:
 			maxlen = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		case 8:
 			maxlattr = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 #ifdef COLORLS
 			if (!f_color)
 #endif
 				f_notabs = 0;
-			/* fall through */
+			/* FALLTHROUGH */
 		default:
 			break;
 		}

bin/sh/expand.c

@@ -893,7 +893,7 @@ varvalue(char *name, int quoted, int allow_split)
 			}
 			break;
 		}
-		/* fall through */
+		/* FALLTHROUGH */
 	case '*':
 		if (ifsset() != 0)
 			sep = ifsval()[0];

bin/sh/parser.c

@@ -193,7 +193,7 @@ list(int nlflag)
 		case TBACKGND:
 		case TSEMI:
 			tok = readtoken();
-			/* fall through */
+			/* FALLTHROUGH */
 		case TNL:
 			if (tok == TNL) {
 				parseheredoc();