command: Add constants for cmd_get_data_size string / error

At present these values are open-coded in a few places. Add constants so
the meaning is clear.

Also add a comment to cmd_get_data_size()

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

2 files changed, 3 insertions, 3 deletions

diff --git a/cmd/itest.c b/cmd/itest.c
index a0cf4bee04..9a441ce9b8 100644
--- a/cmd/itest.c
+++ b/cmd/itest.c
@@ -197,10 +197,10 @@ static int do_itest(struct cmd_tbl *cmdtp, int flag, int argc,
 #endif
 		value = binary_test (argv[2], argv[1], argv[3], w);
 		break;
-	case -2:
+	case CMD_DATA_SIZE_STR:
 		value = binary_test (argv[2], argv[1], argv[3], 0);
 		break;
-	case -1:
+	case CMD_DATA_SIZE_ERR:
 	default:
 		puts("Invalid data width specifier\n");
 		value = 0;
diff --git a/cmd/mem.c b/cmd/mem.c
index 56e1d0755b..1d4f2bab2f 100644
--- a/cmd/mem.c
+++ b/cmd/mem.c
@@ -393,7 +393,7 @@ static int do_mem_search(struct cmd_tbl *cmdtp, int flag, int argc,
 		 * Defaults to long if no or incorrect specification.
 		 */
 		size = cmd_get_data_size(argv[0], 4);
-		if (size < 0 && size != -2 /* string */)
+		if (size < 0 && size != CMD_DATA_SIZE_STR)
 			return 1;
 
 		argc--;