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Commit 3edfbc21 authored by Yo Chiang's avatar Yo Chiang
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Set bpmodify usage function 

golang `flag` package's default FlagSet `flag.CommandLine` calls
`flag.Usage` and `os.Exit(2)` on error to print the usage string.
Set `flag.Usage` to our custom usage function.

Test: m bpmodify; bpmodify -h; bpmodify --help
Change-Id: Ida107b0dbb07c291c3d7ea90eda9147d04a7cd51
parent 03d3ee51
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