powerpc/bootwrapper: Use the child-bus #address-cells to decide which range entry to use

The correct #address-cells was still used for the actual translation,
so the impact is only a possibility of choosing the wrong range entry
or failing to find any match.  Most common cases were not affected.
Signed-off-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/boot/devtree.c

@@ -213,7 +213,7 @@ static int find_range(u32 *reg, u32 *ranges, int nregaddr,
 		u32 range_addr[MAX_ADDR_CELLS];
 		u32 range_size[MAX_ADDR_CELLS];
 
-		copy_val(range_addr, ranges + i, naddr);
+		copy_val(range_addr, ranges + i, nregaddr);
 		copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
 
 		if (compare_reg(reg, range_addr, range_size))