Documentation fix devres.txt: lib/iomap.c -> lib/devres.c

Signed-off-by: Brandon Philips <[e-mail]>
Acked-by: Tejun Heo <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/driver-model/devres.txt

···
 resource allocations already do the job.
 
 For an example of single-instance devres type, read pcim_iomap_table()
-in lib/iomap.c.
+in lib/devres.c.
 
 All devres interface functions can be called without context if the
 right gfp mask is given.