common: commands: make commands static

Since most commands are not public, make them static. This
prevents warnings that no common prototype is available.

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
diff --git a/common/cmd_ubifs.c b/common/cmd_ubifs.c
index fdc8bfe..19c8a43 100644
--- a/common/cmd_ubifs.c
+++ b/common/cmd_ubifs.c
@@ -21,7 +21,8 @@
 static int ubifs_initialized;
 static int ubifs_mounted;
 
-int do_ubifs_mount(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_ubifs_mount(cmd_tbl_t *cmdtp, int flag, int argc,
+				char * const argv[])
 {
 	char *vol_name;
 	int ret;
@@ -65,7 +66,8 @@
 	ubifs_initialized = 0;
 }
 
-int do_ubifs_umount(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_ubifs_umount(cmd_tbl_t *cmdtp, int flag, int argc,
+				char * const argv[])
 {
 	if (argc != 1)
 		return CMD_RET_USAGE;
@@ -80,7 +82,8 @@
 	return 0;
 }
 
-int do_ubifs_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_ubifs_ls(cmd_tbl_t *cmdtp, int flag, int argc,
+			char * const argv[])
 {
 	char *filename = "/";
 	int ret;
@@ -103,7 +106,8 @@
 	return ret;
 }
 
-int do_ubifs_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_ubifs_load(cmd_tbl_t *cmdtp, int flag, int argc,
+				char * const argv[])
 {
 	char *filename;
 	char *endp;