[U-Boot] Duplicate environment variables in RAM?!?

[dbrazeau <dbrazeau1024@gmail.com>]

For some variables, for example "ipaddr",  when I try to change them using
"setenv" it does not update the current "ipaddr" variable in RAM it creates
a new one and append it to the end of the variable list.  As a result I end
up having two "ipaddr" variables in RAM, one with the original value and one
with the new value at the end of the list.  If I try to set the variable a
second time it deletes the first instance (the original) and adds the second
new one to the end of the variable list.

This may be a little confusing so here is an abbreviated example. The
'.....' represent the rest of the variables in the list.

Original list of variables
---------------------
.......
ipaddr=10.0.5.2
.......
---------------------

=>setenv ipaddr 10.0.16.4
Now the variables look like this
---------------------
.......
ipaddr=10.0.5.2
.......
ipaddr=10.0.16.4
---------------------

=>setenv ipaddr 10.0.28.7
And now the variables look like this
---------------------
.......
.......
ipaddr=10.0.16.4
ipaddr=10.0.28.7
---------------------

Is this the intended behavior?  I am running an older version (U-Boot 1.3.4)
so maybe this has been fixed. If this is the case could you point me to the
version that it is fixed in.

Thanks.
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