ash: [VAR] Move unsetvar functionality into setvareq

Upstream commit:

    Date: Tue, 25 May 2010 20:55:05 +0800
    [VAR] Move unsetvar functionality into setvareq

    This patch moves the unsetvar code into setvareq so that we can
    no have a pathological case of an unset variable hanging around
    unless it has a bit pinning it like VEXPORT.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

function                                             old     new   delta
setvareq                                             227     303     +76
expmeta                                              517     521      +4
localcmd                                             364     366      +2
unsetcmd                                              96      76     -20
unsetvar                                             129       7    -122
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/2 up/down: 82/-142)           Total: -60 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-vars/unset.right b/shell/hush_test/hush-vars/unset.right
index 1fbe76a..0972742 100644
--- a/shell/hush_test/hush-vars/unset.right
+++ b/shell/hush_test/hush-vars/unset.right
@@ -12,7 +12,7 @@
 0 f g
 0
 ___
-hush: HUSH_VERSION: readonly variable
+hush: VAR_RO: readonly variable
 1 f g
-hush: HUSH_VERSION: readonly variable
+hush: VAR_RO: readonly variable
 1