sstate: Move debug comment to more logical place

The same log message gets output multiple times in the log which look
confusing and is rather pointless. Move the log message to the correct
level.

(From OE-Core rev: 3917409004a830e7ad0646f05ad7421385cbd1de)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/sstate.bbclass

@@ -146,8 +146,8 @@ def sstate_install(ss, d):
         locks.append(bb.utils.lockfile(lock))
 
     for state in ss['dirs']:
+        bb.debug(2, "Staging files from %s to %s" % (state[1], state[2]))
         for walkroot, dirs, files in os.walk(state[1]):
-            bb.debug(2, "Staging files from %s to %s" % (state[1], state[2]))
             for file in files:
                 srcpath = os.path.join(walkroot, file)
                 dstpath = srcpath.replace(state[1], state[2])