ed_setup: do not return prematurely (re: e5c1a73)

This incorrect thing jumped out when reading the code: when
ed_setup needs to fall back to malloc to allocate the output buffer
instead of using the Sfio stream buffer, it returns prematurely,
before handlign reedit (the histreedit shell option) and e_default
(the -v option to 'read'). Instead of returning, wrap the normal
way of reserving the Sfio buffer in an 'else' so that ed_setup
continues correctly either way.

To understand the else clause code, see the manual:
$ man src/lib/libast/man/sfio.3
See under sfreserve(), 'type == SFIO_LOCKR'.

src/cmd/ksh93/edit/edit.c

@@ -536,15 +536,17 @@ void	ed_setup(Edit_t *ep, int fd, int reedit)
 			buff = (char*)sh_malloc(MAXLINE);
 		ep->e_outbase = ep->e_outptr = buff;
 		ep->e_outlast = ep->e_outptr + MAXLINE - 1;
-		return;
 	}
-	qlen = sfset(sfstderr,SFIO_READ,0);
-	/* make sure SFIO_READ not on */
-	ep->e_outbase = ep->e_outptr = (char*)sfreserve(sfstderr,SFIO_UNBOUND,SFIO_LOCKR);
-	ep->e_outlast = ep->e_outptr + sfvalue(sfstderr) - 1;
-	if(qlen)
-		sfset(sfstderr,SFIO_READ,1);
-	sfwrite(sfstderr,ep->e_outptr,0);
+	else
+	{
+		qlen = sfset(sfstderr,SFIO_READ,0);
+		/* make sure SFIO_READ not on */
+		ep->e_outbase = ep->e_outptr = sfreserve(sfstderr,SFIO_UNBOUND,SFIO_LOCKR);
+		ep->e_outlast = ep->e_outptr + sfvalue(sfstderr) - 1;
+		if(qlen)
+			sfset(sfstderr,SFIO_READ,1);
+		sfwrite(sfstderr,ep->e_outptr,0);
+	}
 	ep->e_eol = reedit;
 	if(ep->e_default && (pp = nv_getval(ep->e_default)))
 	{

src/lib/libast/man/sfio.3

@@ -745,7 +745,7 @@ The call \f3sfreserve(f, 0, SFIO_LOCKR)\fP is similar but also locks the stream.
 .Tp
 \f3n > 0\fP:
 \f3sfreserve()\fP will use attempt to get \fIat most\fP \f3n\fP bytes into
-the buffer. Further, if \f3type == 3SFIO_LOCKR\fP (see below), read attempts
+the buffer. Further, if \f3type == SFIO_LOCKR\fP (see below), read attempts
 end on a positive amount.
 
 For a successful reservation, the argument \f3type\fP dictates treatment