IfwApiCheckTask: Drop superfluous CpuBoundWork usage

All the places where the `CpuBoundWork` class was used only waste costly
semaphores, since they were either used to decode JSON responses and
process check results, which shouldn't take that much time worth
acquiring a semaphore.

lib/methods/ifwapichecktask.cpp

@@ -71,17 +71,6 @@ static void ReportIfwCheckResult(
 	}
 }
 
-static void ReportIfwCheckResult(
-	boost::asio::yield_context yc, const Checkable::Ptr& checkable, const Value& cmdLine,
-	const CheckResult::Ptr& cr, const String& output, double start
-)
-{
-	double end = Utility::GetTime();
-	CpuBoundWork cbw (yc);
-
-	ReportIfwCheckResult(checkable, cmdLine, cr, output, start, end);
-}
-
 static const char* GetUnderstandableError(const std::exception& ex)
 {
 	auto se (dynamic_cast<const boost::system::system_error*>(&ex));
@@ -108,9 +97,9 @@ static void DoIfwNetIo(
 		Connect(conn.lowest_layer(), psHost, psPort, yc);
 	} catch (const std::exception& ex) {
 		ReportIfwCheckResult(
-			yc, checkable, cmdLine, cr,
+			checkable, cmdLine, cr,
 			"Can't connect to IfW API on host '" + psHost + "' port '" + psPort + "': " + GetUnderstandableError(ex),
-			start
+			start, Utility::GetTime()
 		);
 		return;
 	}
@@ -121,10 +110,10 @@ static void DoIfwNetIo(
 		sslConn.async_handshake(conn.next_layer().client, yc);
 	} catch (const std::exception& ex) {
 		ReportIfwCheckResult(
-			yc, checkable, cmdLine, cr,
+			checkable, cmdLine, cr,
 			"TLS handshake with IfW API on host '" + psHost + "' (SNI: '" + san
 				+ "') port '" + psPort + "' failed: " + GetUnderstandableError(ex),
-			start
+			start, Utility::GetTime()
 		);
 		return;
 	}
@@ -139,10 +128,10 @@ static void DoIfwNetIo(
 		}
 
 		ReportIfwCheckResult(
-			yc, checkable, cmdLine, cr,
+			checkable, cmdLine, cr,
 			"Certificate validation failed for IfW API on host '" + psHost + "' (SNI: '" + san + "'; CN: "
 				+ (cn.IsString() ? "'" + cn + "'" : "N/A") + ") port '" + psPort + "': " + sslConn.GetVerifyError(),
-			start
+			start, Utility::GetTime()
 		);
 		return;
 	}
@@ -152,9 +141,9 @@ static void DoIfwNetIo(
 		conn.async_flush(yc);
 	} catch (const std::exception& ex) {
 		ReportIfwCheckResult(
-			yc, checkable, cmdLine, cr,
+			checkable, cmdLine, cr,
 			"Can't send HTTP request to IfW API on host '" + psHost + "' port '" + psPort + "': " + GetUnderstandableError(ex),
-			start
+			start, Utility::GetTime()
 		);
 		return;
 	}
@@ -163,9 +152,9 @@ static void DoIfwNetIo(
 		http::async_read(conn, buf, resp, yc);
 	} catch (const std::exception& ex) {
 		ReportIfwCheckResult(
-			yc, checkable, cmdLine, cr,
+			checkable, cmdLine, cr,
 			"Can't read HTTP response from IfW API on host '" + psHost + "' port '" + psPort + "': " + GetUnderstandableError(ex),
-			start
+			start, Utility::GetTime()
 		);
 		return;
 	}
@@ -177,7 +166,6 @@ static void DoIfwNetIo(
 		sslConn.async_shutdown(yc[ec]);
 	}
 
-	CpuBoundWork cbw (yc);
 	Value jsonRoot;
 
 	try {