http-backend: remove a duplicated code branch

Try to make reading the computation of the gzipped flag a bit more
natural.

Signed-off-by: Robin Dupret <robin.dupret@hey.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-backend.c

@@ -466,9 +466,7 @@ static void run_service(const char **argv, int buffer_input)
 	struct child_process cld = CHILD_PROCESS_INIT;
 	ssize_t req_len = get_content_length();
 
-	if (encoding && !strcmp(encoding, "gzip"))
-		gzipped_request = 1;
-	else if (encoding && !strcmp(encoding, "x-gzip"))
+	if (encoding && (!strcmp(encoding, "gzip") || !strcmp(encoding, "x-gzip")))
 		gzipped_request = 1;
 
 	if (!user || !*user)