buildman: Fix tabs in GetWrapper()

This function has tabs instead of spaces. Fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/buildman/toolchain.py b/tools/buildman/toolchain.py
index b3c6182..a65737f 100644
--- a/tools/buildman/toolchain.py
+++ b/tools/buildman/toolchain.py
@@ -135,8 +135,8 @@
     def GetWrapper(self, show_warning=True):
         """Get toolchain wrapper from the setting file.
         """
-	value = ''
-	for name, value in bsettings.GetItems('toolchain-wrapper'):
+        value = ''
+        for name, value in bsettings.GetItems('toolchain-wrapper'):
             if not value:
                 print "Warning: Wrapper not found"
         if value: