mc config generates a config then fails

[fkautz]

Steps to reproduce

$ rm -rf ~/.mc/
$ mc --debug config generate
<nil>
mc: Unable to generate config file /home/fkautz/.mc/config.json

# config exists at this point

$ mc --debug config generate
Config exists
- 0 viosys-carbon:/home/fkautz/gopath/src/github.com/minio-io/mc/cmd-config.go:144 main.saveConfig(): {"sys.arch":"amd64","sys.cpus":"4","sys.go":"go1.4.2","sys.host":"viosys-carbon","sys.mem.allocated":"178KB","sys.mem.heap.allocated":"836KB","sys.mem.heap.used":"145KB","sys.mem.used":"145KB","sys.os":"linux"}
- 1 viosys-carbon:/home/fkautz/gopath/src/github.com/minio-io/mc/cmd-config.go:273 main.doConfigCmd(): {"sys.arch":"amd64","sys.cpus":"4","sys.go":"go1.4.2","sys.host":"viosys-carbon","sys.mem.allocated":"181KB","sys.mem.heap.allocated":"836KB","sys.mem.heap.used":"148KB","sys.mem.used":"148KB","sys.os":"linux"}
mc: Configuration file /home/fkautz/.mc/config.json already exists

[lock]

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