Revert "mmc: Fixes after updates. Fixed CMD52 CRC Errors."

This reverts commit 216b55c4a70c507d9d5dc5c4d81c0a1d9a3496f1.

Change-Id: I08773ef3ea05bdce7577eb9e52de841f4fb22a8e
tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1

syscall_get_nr can return -1 in the case that the task is not executing
a system call.

This patch fixes perf_syscall_{enter,exit} to check that the syscall
number is valid before using it as an index into a bitmap.

Link: http://lkml.kernel.org/r/1345137254-7377-1-git-send-email-will.deacon@arm.com

Change-Id: Ie730f03d82ed3e44b53a6fe42b97172b435f04eb
Cc: Jason Baron <jbaron@redhat.com>
Cc: Wade Farnsworth <wade_farnsworth@mentor.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>