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Return error from cmd.Wait() #56
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Check and return the error returned by
cmd.Wait(), instead of quietly logging and ignoring.Ignoring this error, because the subsequent call to
ctx.Err()may returnnileven ifcmd.Wait()returned an actual error. For instance,git show-ref --verify <non-existent-branch>will fail with a exit code of 128, andcmd.Wait()will return an error, butcmd.Wait()will returnnil.