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Consider the case where the int(barCols)-cpuBars is negative,solve negative Repeat count bug
panic: strings: negative Repeat count
goroutine 1 [running]:
strings.Repeat(0x2e33731, 0x1, 0xffffffffffffffd8, 0x0, 0x0)
/usr/local/go/src/strings/strings.go:529 +0x5e5
main.glob..func46(0xc0006628c0, 0x0, 0x0)
/mnt/filecoin-lvm/labs/labs/lotus/cmd/lotus-storage-miner/sealing.go:97 +0x9ea
github.com/urfave/cli/v2.(*Command).Run(0x58c65e0, 0xc0006627c0, 0x0, 0x0)
/mnt/filecoin-lvm/labs/labs/go/pkg/mod/github.com/urfave/cli/v2@v2.2.0/command.go:164 +0x4ed
github.com/urfave/cli/v2.(*App).RunAsSubcommand(0xc000524480, 0xc0006625c0, 0x0, 0x0)
/mnt/filecoin-lvm/labs/labs/go/pkg/mod/github.com/urfave/cli/v2@v2.2.0/app.go:427 +0xa9f