lib: zstd: fix repeated words in comments

Delete the redundant word 'the'.

Signed-off-by: Jilin Yuan <yuanjilin@cdjrlc.com>
Signed-off-by: Nick Terrell <terrelln@fb.com>

Author: Jilin Yuan

lib/zstd/compress/zstd_compress.c

@@ -4441,7 +4441,7 @@ static size_t ZSTD_validateSequence(U32 offCode, U32 matchLength,
                                     size_t posInSrc, U32 windowLog, size_t dictSize, U32 minMatch) {
     size_t offsetBound;
     U32 windowSize = 1 << windowLog;
-    /* posInSrc represents the amount of data the the decoder would decode up to this point.
+    /* posInSrc represents the amount of data the decoder would decode up to this point.
      * As long as the amount of data decoded is less than or equal to window size, offsets may be
      * larger than the total length of output decoded in order to reference the dict, even larger than
      * window size. After output surpasses windowSize, we're limited to windowSize offsets again.