Constify nm format array

[Alan Modra]

	* nm.c (formats, format): Make const.

diff --git a/binutils/nm.c b/binutils/nm.c
index 49726eeb83b..9aad599a9a2 100644
--- a/binutils/nm.c
+++ b/binutils/nm.c
@@ -141,7 +141,7 @@ enum formats
 
 #define FORMAT_DEFAULT FORMAT_BSD
 
-static struct output_fns formats[FORMAT_MAX] =
+static const struct output_fns formats[FORMAT_MAX] =
 {
   {print_object_filename_bsd,
    print_archive_filename_bsd,
@@ -167,7 +167,7 @@ static struct output_fns formats[FORMAT_MAX] =
 
 
 /* The output format to use.  */
-static struct output_fns *format = &formats[FORMAT_DEFAULT];
+static const struct output_fns *format = &formats[FORMAT_DEFAULT];
 static unsigned int print_format = FORMAT_DEFAULT;
 static const char *print_format_string = NULL;
 

-- 
Alan Modra
Australia Development Lab, IBM