aboot: Correcting spelling mistake.

"Invaled" should be Invalid.
"heador" should be header.
Change-Id: Iea6d96cacac42c9ee7896fc21325d11fd1217cb7
diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index 2f526f4..1d7d286 100644
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -328,7 +328,7 @@
 	}
 
 	if (memcmp(hdr->magic, BOOT_MAGIC, BOOT_MAGIC_SIZE)) {
-		dprintf(CRITICAL, "ERROR: Invaled boot image header\n");
+		dprintf(CRITICAL, "ERROR: Invalid boot image header\n");
                 return -1;
 	}
 
@@ -424,12 +424,12 @@
 	offset += page_size;
 
 	if (memcmp(hdr->magic, BOOT_MAGIC, BOOT_MAGIC_SIZE)) {
-		dprintf(CRITICAL, "ERROR: Invaled boot image heador\n");
+		dprintf(CRITICAL, "ERROR: Invalid boot image header\n");
 		return -1;
 	}
 
 	if (hdr->page_size != page_size) {
-		dprintf(CRITICAL, "ERROR: Invaled boot image pagesize. Device pagesize: %d, Image pagesize: %d\n",page_size,hdr->page_size);
+		dprintf(CRITICAL, "ERROR: Invalid boot image pagesize. Device pagesize: %d, Image pagesize: %d\n",page_size,hdr->page_size);
 		return -1;
 	}