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Use defer to unlock mutex in crypto/rand.
R=agl1 CC=golang-dev https://golang.org/cl/3991045
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@ -29,15 +29,14 @@ type devReader struct {
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func (r *devReader) Read(b []byte) (n int, err os.Error) {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.f == nil {
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f, err := os.Open(r.name, os.O_RDONLY, 0)
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if f == nil {
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r.mu.Unlock()
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return 0, err
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}
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r.f = f
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}
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r.mu.Unlock()
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return r.f.Read(b)
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}
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