insane.bbclass: allow reporting all md5 mismatch warnings

instead of exiting when once one md5 mismatch is seen. This would be
helpful to save time on filling md5sum for multiple license check
files.

Signed-off-by Kevin Tian <kevin.tian@intel.com>

meta/classes/insane.bbclass

@@ -326,7 +326,7 @@ def package_qa_check_license(workdir, d):
             bb.error ("md5 data is not matching for ", url)
             bb.note ("The new md5 checksum is ", md5chksum)
             bb.note ("Check if the license information has changed, and if it has update the .bb file with correct license")
-            return False
+            sane = False
 
     return sane