lib/lzo: bugfix when input data is not compressed

When the input data is not compressed at all,
lzo1x_decompress_safe will fail, so call memcpy()
instead.

Signed-off-by: Joris Lijssens <joris.lijssens@gmail.com>

lib/lzo/lzo1x_decompress.c

@@ -98,18 +98,25 @@ int lzop_decompress(const unsigned char *src, size_t src_len,
 		if (dlen > remaining)
 			return LZO_E_OUTPUT_OVERRUN;
 
-		/* decompress */
-		tmp = dlen;
-		r = lzo1x_decompress_safe((u8 *) src, slen, dst, &tmp);
+		/* When the input data is not compressed at all,
+		 * lzo1x_decompress_safe will fail, so call memcpy()
+		 * instead */
+		if (dlen == slen) {
+			memcpy(dst, src, slen);
+		} else {
+			/* decompress */
+			tmp = dlen;
+			r = lzo1x_decompress_safe((u8 *)src, slen, dst, &tmp);
+
+			if (r != LZO_E_OK) {
+				*dst_len = dst - start;
+				return r;
+			}
 
-		if (r != LZO_E_OK) {
-			*dst_len = dst - start;
-			return r;
+			if (dlen != tmp)
+				return LZO_E_ERROR;
 		}
 
-		if (dlen != tmp)
-			return LZO_E_ERROR;
-
 		src += slen;
 		dst += dlen;
 		remaining -= dlen;