common: Use new numeric setenv functions

Use setenv_ulong(), setenv_hex() and setenv_addr() in common/

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_cramfs.c b/common/cmd_cramfs.c
index e7f496e..0e43ab6 100644
--- a/common/cmd_cramfs.c
+++ b/common/cmd_cramfs.c
@@ -146,11 +146,9 @@
 		size = cramfs_load ((char *) offset, &part, filename);
 
 	if (size > 0) {
-		char buf[10];
 		printf("### CRAMFS load complete: %d bytes loaded to 0x%lx\n",
 			size, offset);
-		sprintf(buf, "%x", size);
-		setenv("filesize", buf);
+		setenv_hex("filesize", size);
 	} else {
 		printf("### CRAMFS LOAD ERROR<%x> for %s!\n", size, filename);
 	}