nir/types: Allow single-column matrices

This can sometimes be a convenient way to build vectors.

src/glsl/nir/nir_types.cpp

@@ -252,7 +252,7 @@ glsl_vector_type(enum glsl_base_type base_type, unsigned components)
 const glsl_type *
 glsl_matrix_type(enum glsl_base_type base_type, unsigned rows, unsigned columns)
 {
-   assert(rows > 1 && rows <= 4 && columns > 1 && columns <= 4);
+   assert(rows > 1 && rows <= 4 && columns >= 1 && columns <= 4);
    return glsl_type::get_instance(base_type, rows, columns);
 }