app: aboot: Fail over to next bootable slot, in case of failure.

Fail over to next bootable slot in case of failure to boot current,
bootable boot partition.

Change-Id: I4876d52eaa226e9bdb2f715f4987bd0c3385292f
diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index 693357c..3a32f7d 100755
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -4443,11 +4443,18 @@
 				case ERR_INVALID_PAGE_SIZE:
 				case ERR_DT_PARSE:
 				case ERR_ABOOT_ADDR_OVERLAP:
+				case ERR_INVALID_BOOT_MAGIC:
 					if(partition_multislot_is_supported())
+					{
+						/*
+						 * Deactivate current slot, as it failed to
+						 * boot, and retry next slot.
+						 */
+						partition_deactivate_slot(boot_slot);
 						goto retry_boot;
+					}
 					else
 						break;
-				case ERR_INVALID_BOOT_MAGIC:
 				default:
 					break;
 				/* going to fastboot menu */