fix last chunk check

Author: Joseph Hamman

xarray_schema/components.py

@@ -156,7 +156,7 @@ def validate(
                     if ec < 0:
                         ec = dim_sizes[key]
                     ac = dim_chunks[key]
-                    if not all(a == ec for a in ac[:-1]) or ac[-1] <= ec:
+                    if any([a != ec for a in ac[:-1]]) or ac[-1] > ec:
                         raise SchemaError(f'{key} chunks did not match: {ac} != {ec}')
 
                 else:  # assumes ec is an iterable