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_fdos.c b/common/cmd_fdos.c
index fbee861..8ea1140 100644
--- a/common/cmd_fdos.c
+++ b/common/cmd_fdos.c
@@ -40,7 +40,6 @@
     char *name;
     char *ep;
     int size;
-    char buf [12];
     int drive = CONFIG_SYS_FDC_DRIVE_NUMBER;
 
     /* pre-set load_addr */
@@ -91,8 +90,7 @@
     }
     flush_cache (load_addr, size);
 
-    sprintf(buf, "%x", size);
-    setenv("filesize", buf);
+    setenv_hex("filesize", size);
 
     printf("Floppy DOS load complete: %d bytes loaded to 0x%lx\n",
 	   size, load_addr);