acme, sam, samterm: remove weird switch usage

For whatever reason all three of these programs
contain switches like:

	switch(x) {
	case 1:
		if(cond)
	case 2:
			f();
	}

Like Duff's device, this is legal C but more obscure
than it really needs to be.

This commit assumes those are intended as written
and simply writes them more clearly. I did consider
that maybe they are mistakes, but in the case of sam/regexp.c,
my rewrite in this commit matches the acme/regx.c that
has been in plan9port since I added acme in 2003.
(I didn't bother to dig up the old Plan 9 releases.)

Assuming acme/regx.c has been correct for the past
two decades, this commit should be correct too.

2 files changed, 5 insertions, 3 deletions

diff --git a/src/cmd/sam/cmd.c b/src/cmd/sam/cmd.c
index 7176a827..13bd17e0 100644
--- a/src/cmd/sam/cmd.c
+++ b/src/cmd/sam/cmd.c
@@ -559,9 +559,11 @@ simpleaddr(void)
 		case '.':
 		case '$':
 		case '\'':
-			if(addr.type!='"')
+			if(addr.type=='"')
+				break;
+			/* fall through */
 		case '"':
-				error(Eaddress);
+			error(Eaddress);
 			break;
 		case 'l':
 		case '#':
diff --git a/src/cmd/sam/regexp.c b/src/cmd/sam/regexp.c
index 2e369fe1..57c639d9 100644
--- a/src/cmd/sam/regexp.c
+++ b/src/cmd/sam/regexp.c
@@ -700,11 +700,11 @@ bexecute(File *f, Posn startp)
 				break;
 			case 1:		/* expired; wrap to end */
 				if(sel.p[0].p1>=0)
-			case 3:
 					goto Return;
 				list[0][0].inst = list[1][0].inst = 0;
 				p = f->b.nc;
 				goto doloop;
+			case 3:
 			default:
 				goto Return;
 			}