Fix compiler warnings

[Aditya K]

I recently compiled gcc with clang and found few useful warnings 
(https://gcc.gnu.org/ml/gcc/2015-05/msg00015.html, 
https://gcc.gnu.org/ml/gcc/2015-05/msg00041.html).
I have a patch to fix some of those, it passes bootstrap, please apply these if 
it is useful.


Thanks,
-Aditya

                                          

warnings.patch
Description: Binary data