update location of checking deprecated freq

pandas/_libs/tslibs/offsets.pyx

@@ -5371,6 +5371,11 @@ cpdef to_offset(freq, bint is_period=False):
 
  tups = zip(split[0::4], split[1::4], split[2::4], strict=False)
  for n, (sep, stride, name) in enumerate(tups):
+ if name in deprec_to_valid_alias:
+ raise ValueError(INVALID_FREQ_ERR_MSG.format(
+ f"{name}. Did you mean {deprec_to_valid_alias[name]}?")
+ )
+
  name = _warn_about_deprecated_aliases(name, is_period)
  _validate_to_offset_alias(name, is_period)
  if is_period:
@@ -5401,8 +5406,6 @@ cpdef to_offset(freq, bint is_period=False):
  # If n==0, then stride_sign is already incorporated
  # into the offset
  offset *= stride_sign
- elif name in deprec_to_valid_alias:
- raise ValueError(f"Did you mean '{deprec_to_valid_alias[name]}'?")
  else:
  stride = int(stride)
  offset = _get_offset(name)

pandas/tests/tseries/offsets/test_offsets.py

@@ -1158,7 +1158,7 @@ def test_offset_multiplication(
 
 
 def test_offset_deprecated_error():
- with pytest.raises(ValueError, match=r"Did you mean 'h'?"):
+ with pytest.raises(ValueError, match=r"Did you mean h?"):
  date_range("2012-01-01", periods=3, freq="H")