Drop cruft in db code brought in by 1.8x.

We don't allocate memory to receive data from db, so the cruft left
was only accessing db twice for lone lines.

Also clear the influenced comments.

common/line.c

@@ -10,7 +10,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "$Id: line.c,v 10.26 2011/08/12 12:36:41 zy Exp $";
+static const char sccsid[] = "$Id: line.c,v 10.27 2015/04/03 02:47:59 zy Exp $";
 #endif /* not lint */
 
 #include <sys/types.h>
@@ -92,7 +92,6 @@ db_get(
 	recno_t l1, l2;
 	CHAR_T *wp;
 	size_t wlen;
-	size_t nlen;
 
 	/*
 	 * The underlying recno stuff handles zero by returning NULL, but
@@ -152,8 +151,6 @@ db_get(
 	ep->c_lno = OOBLNO;
 
 nocache:
-	nlen = 1024;
-retry:
 	/* Get the line from the underlying database. */
 	key.data = &lno;
 	key.size = sizeof(lno);
@@ -169,11 +166,6 @@ err3:		if (lenp != NULL)
 		if (pp != NULL)
 			*pp = NULL;
 		return (1);
-	case 0:
-		if (data.size > nlen) {
-			nlen = data.size;
-			goto retry;
-		}
 	}
 
 	if (FILE2INT(sp, data.data, data.size, wp, wlen)) {
@@ -544,8 +536,6 @@ db_last(
 	case 1:
 		*lnop = 0;
 		return (0);
-	case 0:
-		;
 	}
 
 	memcpy(&lno, key.data, sizeof(lno));
@@ -595,7 +585,6 @@ db_rget(
 	key.data = &lno;
 	key.size = sizeof(lno);
 	if (ep->db->get(ep->db, &key, &data, 0))
-	/* We do not report error, and do not ensure the size! */
 		return (1);
 
 	if (lenp != NULL)
@@ -624,14 +613,13 @@ db_rset(
 	/* Check for no underlying file. */
 	if ((ep = sp->ep) == NULL)
 		return (1);
-		
+
 	/* Update file. */
 	key.data = &lno;
 	key.size = sizeof(lno);
 	data.data = p;
 	data.size = len;
 	if (ep->db->put(ep->db, &key, &data, 0) == -1)
-	/* We do not report error, and do not ensure the size! */
 		return (1);
 
 	return (0);