libfdt: De-inline fdt_header_size()

There does not seem to be a strong reason to inline this function. Also
we are about to add some extra code to it which will increase its size.

Move it into fdt.c and use a simple declaration in libfdt.h

Signed-off-by: Simon Glass <sjg@chromium.org>
Message-Id: <20200220214557.176528-2-sjg@chromium.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

libfdt/fdt.c

@@ -70,6 +70,11 @@ size_t fdt_header_size_(uint32_t version)
 		return FDT_V17_SIZE;
 }
 
+size_t fdt_header_size(const void *fdt)
+{
+	return fdt_header_size_(fdt_version(fdt));
+}
+
 int fdt_check_header(const void *fdt)
 {
 	size_t hdrsize;

libfdt/libfdt.h

@@ -266,11 +266,12 @@ fdt_set_hdr_(size_dt_struct);
  * fdt_header_size - return the size of the tree's header
  * @fdt: pointer to a flattened device tree
  */
+size_t fdt_header_size(const void *fdt);
+
+/**
+ * fdt_header_size_ - internal function which takes a version number
+ */
 size_t fdt_header_size_(uint32_t version);
-static inline size_t fdt_header_size(const void *fdt)
-{
-	return fdt_header_size_(fdt_version(fdt));
-}
 
 /**
  * fdt_check_header - sanity check a device tree header

libfdt/version.lds

@@ -20,6 +20,7 @@ LIBFDT_1.2 {
 		fdt_get_alias_namelen;
 		fdt_get_alias;
 		fdt_get_path;
+                fdt_header_size;
 		fdt_supernode_atdepth_offset;
 		fdt_node_depth;
 		fdt_parent_offset;