mem_region: fix inconsistent indenting
mem_region: fix inconsistent indenting

Found by smatch static analysis (http://smatch.sourceforge.net/):
core/mem_region.c:561 mem_check() warn: inconsistent indenting
core/mem_region.c:569 mem_check() warn: inconsistent indenting

Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

qemu/skiboot,shenki/skiboot,open-power/skiboot,legoater/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,shenki/skiboot,open-power/skiboot,open-power/skiboot,mikey/skiboot,legoater/skiboot,open-power/skiboot,stewart-ibm/skiboot,mikey/skiboot,qemu/skiboot,qemu/skiboot,stewart-ibm/skiboot,qemu/skiboot,shenki/skiboot,shenki/skiboot,legoater/skiboot,stewart-ibm/skiboot,shenki/skiboot,legoater/skiboot,mikey/skiboot