app: aboot: Fix return statements in cmd_boot function

cmd_boot is a void function & returning values on failure.
Fix these return statements.

CRs-Fixed: 568529
Change-Id: I3a7893862e18a4f6700a0a929530bb424e34272c
diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index 71c6128..a8a7e66 100755
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -1454,7 +1454,7 @@
 		check_aboot_addr_range_overlap(hdr->ramdisk_addr, ramdisk_actual))
 	{
 		dprintf(CRITICAL, "kernel/ramdisk addresses overlap with aboot addresses.\n");
-		return -1;
+		return;
 	}
 
 	/* sz should have atleast raw boot image */
@@ -1472,7 +1472,7 @@
 	if (check_aboot_addr_range_overlap(hdr->tags_addr, MAX_TAGS_SIZE))
 	{
 		dprintf(CRITICAL, "Tags addresses overlap with aboot addresses.\n");
-		return -1;
+		return;
 	}
 #endif
 
@@ -1502,7 +1502,7 @@
 	if (check_aboot_addr_range_overlap(hdr->tags_addr, MAX_TAGS_SIZE))
 	{
 		dprintf(CRITICAL, "Tags addresses overlap with aboot addresses.\n");
-		return -1;
+		return;
 	}
 #endif