Is it discouraged to use one-liner for-loops or if-statements in Go?

For example, a simple check for an empty string:

if s == "" { return 0 }

Or, a for-loop to pre-fill an array with -1 (I don't think there's an easier way to do this):

for i := range m { m[i] = -1 }

Is this generally discouraged, even if these functions are extremely simple altogether? I don't mean to be pedantic, but am generally curious what the sentiment for this is.