Fixed: Mount handling logic of net namespaces as seen on QNAP.

fixes #1483

src/NzbDrone.Mono/Disk/ProcMountProvider.cs

@@ -96,6 +96,7 @@ namespace NzbDrone.Mono.Disk
             if (split.Length != 6)
             {
                 _logger.Debug("Unable to parse {0} line: {1}", PROC_MOUNTS_FILENAME, line);
+                return null;
             }
 
             var name = split[0];
@@ -103,6 +104,13 @@ namespace NzbDrone.Mono.Disk
             var type = split[2];
             var options = ParseOptions(split[3]);
 
+            if (!mount.StartsWith("/"))
+            {
+                // Possible a namespace like 'net:[1234]'.
+                // But we just filter anything not starting with /, we're not interested in anything that isn't mounted somewhere.
+                return null;
+            }
+
             var driveType = FindDriveType.Find(type);
 
             if (name.StartsWith("/dev/") || GetFileSystems().GetValueOrDefault(type, false))