Correct error

Author: rhpvorderman

src/isal/igzip.py

@@ -249,7 +249,7 @@ def compress(data, compresslevel=_COMPRESS_LEVEL_BEST, *, mtime=None):
 
 def _gzip_header_end(data: bytes) -> int:
     if len(data) < 10:
-        raise ValueError("Gzip header should be 10 bytes or more")
+        raise BadGzipFile("Gzip header should be 10 bytes or more")
     # We are not interested in mtime, xfl and os flags.
     magic, method, flags = struct.unpack("<HBB", data[:4])
     if magic != 0x8b1f: