reiserfsprogs: add helpers for constant endian routines

Initializing structures with little endian values requires a const
value. This means that the endian routines that are macro blocks
cause build failures.

This patch introduces constant_ macros that don't involve an
assignment. These can only be used with constant values or
unexpected results may occur.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>

reiserfscore/reiserfslib.c

@@ -13,8 +13,9 @@ struct reiserfs_key root_dir_key = { 0, 0, {{0, 0},} };
 struct reiserfs_key parent_root_dir_key = { 0, 0, {{0, 0},} };
 struct reiserfs_key lost_found_dir_key = { 0, 0, {{0, 0},} };
 static struct reiserfs_key badblock_key =
-    { cpu_to_le32(BADBLOCK_DIRID), cpu_to_le32(BADBLOCK_OBJID),
-      {{cpu_to_le32(0), cpu_to_le32(0)},} };
+    { constant_cpu_to_le32(BADBLOCK_DIRID),
+      constant_cpu_to_le32(BADBLOCK_OBJID),
+      {{constant_cpu_to_le32(0), constant_cpu_to_le32(0)},} };
 
 __u16 root_dir_format = 0;
 __u16 lost_found_dir_format = 0;

reiserfscore/stree.c

@@ -174,13 +174,14 @@ int bin_search(void *p_v_key,	/* Key to search for.                   */
 
 /* Minimal possible key. It is never in the tree. */
 const struct reiserfs_key MIN_KEY =
-	{ cpu_to_le32(0), cpu_to_le32(0),
-	  {{cpu_to_le32(0), cpu_to_le32(0)},} };
+	{ constant_cpu_to_le32(0), constant_cpu_to_le32(0),
+	  {{constant_cpu_to_le32(0), constant_cpu_to_le32(0)},} };
 
 /* Maximal possible key. It is never in the tree. */
 const struct reiserfs_key MAX_KEY =
-	{ cpu_to_le32(0xffffffff), cpu_to_le32(0xffffffff),
-	  {{cpu_to_le32(0xffffffff), cpu_to_le32(0xffffffff)},} };
+	{ constant_cpu_to_le32(0xffffffff), constant_cpu_to_le32(0xffffffff),
+	  {{constant_cpu_to_le32(0xffffffff),
+	    constant_cpu_to_le32(0xffffffff)},} };
 
 /* Get delimiting key of the buffer by looking for it in the buffers in the
    path, starting from the bottom of the path, and going upwards.  We must