md5: add "const" qualifier to the "file" argument

This is intended to fix the following compiler warning in opkg-lede:

    /home/yousong/git-repo/lede-project/opkg-lede/libopkg/file_util.c: In function ‘file_md5sum_alloc’:
    /home/yousong/git-repo/lede-project/opkg-lede/libopkg/file_util.c:144:2: warning: passing argument 1 of ‘md5sum’ discards ‘const’ qualifier from pointer target type [enabled by default]
    In file included from /home/yousong/git-repo/lede-project/opkg-lede/libopkg/file_util.c:28:0:
    /home/yousong/.usr/include/libubox/md5.h:56:5: note: expected ‘char *’ but argument is of type ‘const char *’

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/md5.h b/md5.h
index b2f1b80..d3ee4e3 100644
--- a/md5.h
+++ b/md5.h
@@ -53,6 +53,6 @@ typedef struct md5_ctx {
 extern void md5_begin(md5_ctx_t *ctx);
 extern void md5_hash(const void *data, size_t length, md5_ctx_t *ctx);
 extern void md5_end(void *resbuf, md5_ctx_t *ctx);
-int md5sum(char *file, void *md5_buf);
+int md5sum(const char *file, void *md5_buf);
 
 #endif