Corrected faulty filesystem freespace check on non-Windows

sickbeard/helpers.py

@@ -1633,13 +1633,17 @@ def isFileLocked(file, writeLockCheck=False):
 
 def getDiskSpaceUsage(diskPath=None):
     '''
-    returns the free space in MB for a given path
+    returns the free space in MB for a given path or False if no path given
     @param diskPath: the filesystem path being checked
     '''
+
+    if diskPath:
         if platform.system() == 'Windows':
             free_bytes = ctypes.c_ulonglong(0)
             ctypes.windll.kernel32.GetDiskFreeSpaceExW(ctypes.c_wchar_p(diskPath), None, None, ctypes.pointer(free_bytes))
             return free_bytes.value / 1024 / 1024
         else:
-        st = os.statvfs(sickbeard.TV_DOWNLOAD_DIR)
+            st = os.statvfs(diskPath)
             return st.f_bavail * st.f_frsize / 1024 / 1024
+    else:
+        return False