Update print_buffer() to use const

The buffer cannot be changed by this function, so change the buffer
pointer to a const. This allows callers with const pointer to use the
function without a cast.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/common.h

@@ -270,7 +270,8 @@ int	cpu_init(void);
 phys_size_t initdram (int);
 int	display_options (void);
 void	print_size(unsigned long long, const char *);
-int	print_buffer (ulong addr, void* data, uint width, uint count, uint linelen);
+int print_buffer(ulong addr, const void *data, uint width, uint count,
+		 uint linelen);
 
 /* common/main.c */
 void	main_loop	(void);

lib/display_options.c

@@ -98,7 +98,8 @@ void print_size(unsigned long long size, const char *s)
  */
 #define MAX_LINE_LENGTH_BYTES (64)
 #define DEFAULT_LINE_LENGTH_BYTES (16)
-int print_buffer (ulong addr, void* data, uint width, uint count, uint linelen)
+int print_buffer(ulong addr, const void *data, uint width, uint count,
+		 uint linelen)
 {
 	/* linebuf as a union causes proper alignment */
 	union linebuf {