sparc: _sparc_find_resource() should check for exact matches

The address that's passed to _sparc_find_resource() should always be the
start address of a resource:
  - iounmap() passes a page-aligned virtual address, while the original
    address was created by adding the in-page offset to the resource's
    start address,
  - sbus_free_coherent() and pci32_free_coherent() should be passed an
    address obtained from sbus_alloc_coherent() resp. pci32_alloc_coherent(),
    which is always a resource's start address.

Hence replace the range check by a check for an exact match.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/ioport.c

@@ -723,12 +723,12 @@ static const struct file_operations sparc_io_proc_fops = {
  * This probably warrants some sort of hashing.
  */
 static struct resource *_sparc_find_resource(struct resource *root,
-					     unsigned long hit)
+					     unsigned long start)
 {
 	struct resource *tmp;
 
 	for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
-		if (tmp->start <= hit && tmp->end >= hit)
+		if (tmp->start == start)
 			return tmp;
 	}
 	return NULL;