libdtc: remove duplicate judgments

There is no need to check the VALID_DTB repeatedly, and can be combined
into one if statement.

Signed-off-by: Jia Xianhua <jiaxianhua@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

libfdt/fdt.c

@@ -106,7 +106,6 @@ int fdt_check_header(const void *fdt)
 	}
 	hdrsize = fdt_header_size(fdt);
 	if (!can_assume(VALID_DTB)) {
-
 		if ((fdt_totalsize(fdt) < hdrsize)
 		    || (fdt_totalsize(fdt) > INT_MAX))
 			return -FDT_ERR_TRUNCATED;
@@ -115,9 +114,7 @@ int fdt_check_header(const void *fdt)
 		if (!check_off_(hdrsize, fdt_totalsize(fdt),
 				fdt_off_mem_rsvmap(fdt)))
 			return -FDT_ERR_TRUNCATED;
-	}
 
-	if (!can_assume(VALID_DTB)) {
 		/* Bounds check structure block */
 		if (!can_assume(LATEST) && fdt_version(fdt) < 17) {
 			if (!check_off_(hdrsize, fdt_totalsize(fdt),