Fix indent for error handling in freeze

src/pystencils/backend/kernelcreation/freeze.py

@@ -200,11 +200,11 @@ class FreezeExpressions:
                         f"Different reduction operation {info.op} already exists "
                         f"for {expr.lhs} with target reduction op {expr.reduction_op}."
                     )
-                else:
-                    raise FreezeError(
-                        f"Left-hand side {expr.lhs} of ReductionAssignment already exists in symbol table."
-                        f"Make sure that it is exclusively used within the kernel to conduct ReductionAssignment's."
-                    )
+            else:
+                raise FreezeError(
+                    f"Left-hand side {expr.lhs} of ReductionAssignment already exists in symbol table."
+                    f"Make sure that it is exclusively used within the kernel to conduct ReductionAssignment's."
+                )
 
         lhs = self.visit(expr.lhs)
         rhs = self.visit(expr.rhs)