multiboot: fprintf(stderr...) -> error_report()

multiboot: fprintf(stderr...) -> error_report()

Change all fprintf(stderr...) calls in hw/i386/multiboot.c to call
error_report() instead, including the mb_debug macro.  Remove the "\n"
from strings passed to all modified calls, since error_report() appends
one.

Signed-off-by: Jack Schwartz <jack.schwartz@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 4b9006a41ea8818f2385ae5228e07f211bb4a33d)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>