lib/curl/Easy: add method Unpause()

src/lib/curl/Easy.hxx

@@ -160,6 +160,10 @@ public:
 		SetOption(CURLOPT_HTTPPOST, post);
 	}
 
+	bool Unpause() noexcept {
+		return ::curl_easy_pause(handle, CURLPAUSE_CONT) == CURLE_OK;
+	}
+
 	char *Escape(const char *string, int length=0) const noexcept {
 		return curl_easy_escape(handle, string, length);
 	}

src/lib/curl/Request.cxx

@@ -120,7 +120,7 @@ CurlRequest::Resume() noexcept
 {
 	assert(registered);
 
-	curl_easy_pause(easy.Get(), CURLPAUSE_CONT);
+	easy.Unpause();
 
 	if (IsCurlOlderThan(0x072000))
 		/* libcurl older than 7.32.0 does not update