(fix) [nvram2env] nvram2env scans only 1/4th of memory

[mizhka]

Summary

The variable "size" stores number of words (4bytes). But the loop over memory uses size as number of bytes to scan memory. As result it fetches only 1/4th of memory.

This patch solves this problem and nvram2env fetches all NVRAM variables.

Test Plan

Pre-requisites: any MIPS board with ASCII-based NVRAM mapped into memory

1. Add "device nvram2env" into kernel configuration
2. Specify hints: base is mandatory (according to nvram2env(4))

hint.nvram.0.base=0x1c7f8000 (it's valid address for Asus RT-N53 with flags = 0x4)

3. Build & load kernel with bootverbose

Actual result: only part of nvram variables are found
Expected result: all variables are found

[mizhka]

• remove shifting for size
• cosmetic changes like style(9), remove extra indentation, remove calculation from "for" statement condition.