staging: erofs: fixed -Wmissing-prototype warnings by making functions static.

Define three functions which are not used outside their own
translation-units as static in order to fix the following warnings:

  drivers/staging/erofs/utils.c:134:6: warning: no previous prototype for ‘erofs_try_to_release_workgroup’ [-Wmissing-prototypes]
   bool erofs_try_to_release_workgroup(struct erofs_sb_info *sbi,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  drivers/staging/erofs/unzip_vle.c:592:6: warning: no previous prototype for ‘z_erofs_vle_work_release’ [-Wmissing-prototypes]
   void z_erofs_vle_work_release(struct z_erofs_vle_work *work)
        ^~~~~~~~~~~~~~~~~~~~~~~~

  drivers/staging/erofs/unzip_vle_lz4.c:16:5: warning: no previous prototype for ‘z_erofs_unzip_lz4’ [-Wmissing-prototypes]
   int z_erofs_unzip_lz4(void *in, void *out, size_t inlen, size_t outlen)
       ^~~~~~~~~~~~~~~~~

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/staging/erofs/unzip_vle_lz4.c b/drivers/staging/erofs/unzip_vle_lz4.c
index 52797bd89da1..8e8d705a6861 100644
--- a/drivers/staging/erofs/unzip_vle_lz4.c
+++ b/drivers/staging/erofs/unzip_vle_lz4.c
@@ -13,7 +13,7 @@
 #include "unzip_vle.h"
 #include <linux/lz4.h>
 
-int z_erofs_unzip_lz4(void *in, void *out, size_t inlen, size_t outlen)
+static int z_erofs_unzip_lz4(void *in, void *out, size_t inlen, size_t outlen)
 {
 	int ret = LZ4_decompress_safe_partial(in, out, inlen, outlen, outlen);