fs: Use new numeric setenv functions

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

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/fs/fs.c b/fs/fs.c
index 023e7ef..2c9f2c5 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -256,7 +256,6 @@
 	unsigned long bytes;
 	unsigned long pos;
 	int len_read;
-	char buf[12];
 	unsigned long time;
 
 	if (argc < 2)
@@ -308,8 +307,7 @@
 	}
 	puts("\n");
 
-	sprintf(buf, "0x%x", len_read);
-	setenv("filesize", buf);
+	setenv_hex("filesize", len_read);
 
 	return 0;
 }
diff --git a/fs/ubifs/ubifs.c b/fs/ubifs/ubifs.c
index 44be3f5..273c0a9 100644
--- a/fs/ubifs/ubifs.c
+++ b/fs/ubifs/ubifs.c
@@ -687,7 +687,6 @@
 	int i;
 	int count;
 	int last_block_size = 0;
-	char buf [10];
 
 	c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
 	/* ubifs_findfile will resolve symlinks, so we know that we get
@@ -740,8 +739,7 @@
 	if (err)
 		printf("Error reading file '%s'\n", filename);
 	else {
-	        sprintf(buf, "%X", size);
-		setenv("filesize", buf);
+		setenv_hex("filesize", size);
 		printf("Done\n");
 	}