Patch to libraries that were inappropriately using globals.

Often two (or more) scripts using the same library would
overwrite the globals each was using. This would result
in (at best) an error or (at worst) a deadlock.

The patch changes the global accesses to local.

nselib/snmp.lua

@@ -176,6 +176,7 @@ local function decodeSeq(encStr, len, pos)
    local sStr
    pos, sStr = bin.unpack("A" .. len, encStr, pos)
    while (sPos < len) do
+      local newSeq
       sPos, newSeq = decode(sStr, sPos)
       table.insert(seq, newSeq)
       i = i + 1
@@ -206,6 +207,7 @@ function decode(encStr, pos)
    elseif (etype == "06") then -- OID
       local oid = {}
       oid._snmp = '06'
+      local octet
       pos, octet = bin.unpack("C", encStr, pos)
       oid[2] = math.mod(octet, 40)
       octet = octet - oid[2]