Correct spelling mistakes.

code/tools/lcc/src/enode.c

@@ -401,7 +401,7 @@ Tree addrof(Tree p) {
 			Symbol t1 = q->u.sym;
 			q->u.sym = 0;
 			q = idtree(t1);
-			/* fall thru */
+			/* fall through */
 			}
 		case INDIR:
 			if (p == q)

code/tools/lcc/src/error.c

@@ -80,7 +80,7 @@ int fatal(const char *name, const char *fmt, int n) {
 	return 0;
 }
 
-/* printtoken - print current token preceeded by a space */
+/* printtoken - print current token preceded by a space */
 static void printtoken(void) {
 	switch (t) {
 	case ID: fprint(stderr, " `%s'", token); break;

code/tools/lcc/src/gen.c

@@ -292,7 +292,7 @@ static void dumptree(Node p) {
 			dumptree(p->kids[0]);
 			break;
 		}
-		/* else fall thru */
+		/* else fall through */
 	case EQ: case NE: case GT: case GE: case LE: case LT:
 	case ASGN: case BOR: case BAND: case BXOR: case RSH: case LSH:
 	case ADD: case SUB:  case DIV: case MUL: case MOD:

code/tools/lcc/src/init.c

@@ -40,7 +40,7 @@ static int genconst(Tree e, int def) {
 			if (isarith(e->type))
 				error("cast from `%t' to `%t' is illegal in constant expressions\n",
 					e->kids[0]->type, e->type);
-			/* fall thru */
+			/* fall through */
 		case CVI: case CVU: case CVF:
 			e = e->kids[0];
 			continue;

code/tools/lcc/src/tree.c

@@ -86,7 +86,7 @@ static Tree root1(Tree p) {
 			warning("reference to `%t' elided\n", p->type);
 		if (isptr(p->kids[0]->type) && isvolatile(p->kids[0]->type->type))
 			warning("reference to `volatile %t' elided\n", p->type);
-		/* fall thru */
+		/* fall through */
 	case CVI: case CVF: case CVU: case CVP:
 	case NEG: case BCOM: case FIELD:
 		if (warn++ == 0)