flex_array: remove unneeded index calculation

flex_array_get() calculates an index value, then drops it on the floor;
simply remove it.

Signed-off-by: Jonathan Corbet <[e-mail]>
Acked-by: Dave Hansen <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

lib/flex_array.c

···
 {
 	int part_nr = fa_element_to_part_nr(fa, element_nr);
 	struct flex_array_part *part;
-	int index;
 
 	if (element_nr >= fa->total_nr_elements)
 		return NULL;
···
 		part = (struct flex_array_part *)&fa->parts[0];
 	else
 		part = fa->parts[part_nr];
-	index = index_inside_part(fa, element_nr);
 	return &part->elements[index_inside_part(fa, element_nr)];
 }