Improve portability

1) Remove the double parentheses around two comparisons in checks.c.
   The OSX LLVM-based C compiler warns about them.
2) Put an explicit "=" in the TN() macro, in accordance with c99.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
diff --git a/checks.c b/checks.c
index 47eda65..3bf0fa4 100644
--- a/checks.c
+++ b/checks.c
@@ -624,11 +624,11 @@
 	if (!reg && !ranges)
 		return;
 
-	if ((node->parent->addr_cells == -1))
+	if (node->parent->addr_cells == -1)
 		FAIL(c, "Relying on default #address-cells value for %s",
 		     node->fullpath);
 
-	if ((node->parent->size_cells == -1))
+	if (node->parent->size_cells == -1)
 		FAIL(c, "Relying on default #size-cells value for %s",
 		     node->fullpath);
 }
diff --git a/fdtdump.c b/fdtdump.c
index a29aa5e..95a6a20 100644
--- a/fdtdump.c
+++ b/fdtdump.c
@@ -22,7 +22,7 @@
 static const char *tagname(uint32_t tag)
 {
 	static const char * const names[] = {
-#define TN(t) [t] #t
+#define TN(t) [t] = #t
 		TN(FDT_BEGIN_NODE),
 		TN(FDT_END_NODE),
 		TN(FDT_PROP),