refactor: reduce flow-control operations

Signed-off-by: Jesse Simpson <jesse.simpson36@gmail.com>

pkg/engine/engine.go

@@ -397,14 +397,9 @@ func reformatExecErrorMsg(filename string, err error) error {
 		} else {
 			return err
 		}
-		if len(fileLocations) > 0 {
+		if len(fileLocations) == 0 || fileLocations[len(fileLocations)-1] != traceable {
-			lastErr := fileLocations[len(fileLocations)-1]
-			if lastErr == traceable {
-				current = errors.Unwrap(current)
-				continue
-			}
-		}
 			fileLocations = append(fileLocations, traceable)
+		}
 		current = errors.Unwrap(current)
 	}