glsl: set matrix_stride for non matrices with atomic counter buffers

Patch sets matrix_stride as 0 for non matrix uniforms that are in a
atomic counter buffer. Matrix stride calculation for actual matrix
uniforms is done during link_assign_uniform_locations.

From ARB_program_interface_query specification:

GL_MATRIX_STRIDE:

   "For active variables not declared as a matrix or array of matrices,
   zero is written to <params>.  For active variables not backed by a
   buffer object, -1 is written to <params>, regardless of the variable
   type."

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Marta Lofstedt <marta.lofstedt@intel.com>

src/glsl/link_atomics.cpp

@@ -240,6 +240,8 @@ link_assign_atomic_counter_resources(struct gl_context *ctx,
          storage->offset = var->data.atomic.offset;
          storage->array_stride = (var->type->is_array() ?
                                   var->type->without_array()->atomic_size() : 0);
+         if (!var->type->is_matrix())
+            storage->matrix_stride = 0;
       }
 
       /* Assign stage-specific fields. */