simplify

provisioner/windows-shell/provisioner.go

@@ -150,13 +150,9 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 		}
 	}
 
-	if errs != nil {
 	return errs
 }
 
-	return nil
-}
-
 // This function takes the inline scripts, concatenates them
 // into a temporary file and returns a string containing the location
 // of said file.