[PATCH RFC 2/9] lib/lz4: backport upstream's -Wmissing-prototypes fix

[Michal Wilczynski]

v1.10.0 defines LZ4_loadDict_internal() in lz4.c and LZ4HC_searchExtDict()
in lz4hc.c with external linkage and no prototype, which the kernel's
-Wmissing-prototypes rejects. The first also prevents linking, since
lz4_compress.c and lz4_decompress.c both include lz4.c and would each
define it.

Neither can be forward declared static in lz4_deps.h like the other bare
helpers, because their signatures use types declared inside the .c files.

Take the two hunks of upstream commit 5ef1f16929b5
("fix -Wmissing-prototypes warnings") that apply to the files we vendor.
This is the only deviation from the tag, and goes away at the next
re-sync.

Signed-off-by: Michal Wilczynski <m.wilczynski@xxxxxxxxxxx>
---
 lib/lz4/upstream/lz4.c   | 2 +-
 lib/lz4/upstream/lz4hc.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/lz4/upstream/lz4.c b/lib/lz4/upstream/lz4.c
index a2f7abee19fb9a5c768f2a6c266acf5b571f0855..0d474be0236a698d297ab9a430f5082485eb3709 100644
--- a/lib/lz4/upstream/lz4.c
+++ b/lib/lz4/upstream/lz4.c
@@ -1584,7 +1584,7 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_stream)
 
 typedef enum { _ld_fast, _ld_slow } LoadDict_mode_e;
 #define HASH_UNIT sizeof(reg_t)
-int LZ4_loadDict_internal(LZ4_stream_t* LZ4_dict,
+static int LZ4_loadDict_internal(LZ4_stream_t* LZ4_dict,
                     const char* dictionary, int dictSize,
                     LoadDict_mode_e _ld)
 {
diff --git a/lib/lz4/upstream/lz4hc.c b/lib/lz4/upstream/lz4hc.c
index 4d8c36a6978fcae09e4c4a936572b4b271513466..32b29f382268d961d65383b24c7225494d9044ad 100644
--- a/lib/lz4/upstream/lz4hc.c
+++ b/lib/lz4/upstream/lz4hc.c
@@ -360,7 +360,7 @@ typedef struct {
     int back;  /* negative value */
 } LZ4HC_match_t;
 
-LZ4HC_match_t LZ4HC_searchExtDict(const BYTE* ip, U32 ipIndex,
+static LZ4HC_match_t LZ4HC_searchExtDict(const BYTE* ip, U32 ipIndex,
         const BYTE* const iLowLimit, const BYTE* const iHighLimit,
         const LZ4HC_CCtx_internal* dictCtx, U32 gDictEndIndex,
         int currentBestML, int nbAttempts)

-- 
2.34.1