Add hour handling in convertCPUTimes function

This commit add hour handling in convertCPUTimes function.

The time string usually comes from macOS command line:
ps -a -o stime,utime -p <pid>

which could contain hour string.

process/process_darwin.go

@@ -389,22 +389,41 @@ func convertCPUTimes(s string) (ret float64, err error) {
 	var _tmp string
 	if strings.Contains(s, ":") {
 		_t := strings.Split(s, ":")
+		if len(_t) > 3 {
+            return ret, err
+        } else if len(_t) == 3 {
             hour, err := strconv.Atoi(_t[0])
             if err != nil {
                 return ret, err
             }
-		t += hour * 60 * 100
+            t += hour * 60 * 60 * ClockTicks
+
+            mins, err := strconv.Atoi(_t[1])
+            if err != nil {
+                return ret, err
+            }
+            t += mins * 60 * ClockTicks
+            _tmp = _t[2]
+        } else if len(_t) == 2 {
+            mins, err := strconv.Atoi(_t[0])
+            if err != nil {
+                return ret, err
+            }
+            t += mins * 60 * ClockTicks
             _tmp = _t[1]
         } else {
             _tmp = s
         }
+	} else {
+		_tmp = s
+	}
 
 	_t := strings.Split(_tmp, ".")
 	if err != nil {
 		return ret, err
 	}
 	h, err := strconv.Atoi(_t[0])
-	t += h * 100
+	t += h * ClockTicks
 	h, err = strconv.Atoi(_t[1])
 	t += h
 	return float64(t) / ClockTicks, nil