[binutils-gdb] RISC-V: Print an error when unable to align a section

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 9eb7b0acb54e18e7cbca196a8bdb320844a858b3 ***

Author: Palmer Dabbelt <palmer@dabbelt.com>
Branch: master
Commit: 9eb7b0acb54e18e7cbca196a8bdb320844a858b3

RISC-V: Print an error when unable to align a section

This used to just print "can't relax section: Success", which is a silly
error message.

bfd/ChangeLog

2017-09-07  Palmer Dabbelt  <palmer@dabbelt.com>

        * elfnn-riscv.c (_bfd_riscv_relax_align): Call bfd_set_error and
        print an error message when unable to relax a .align directive.