controllers :Fix the failure of shell script to get path

Use -r in shell builtin read. This fixes errors in controllers shell
scripts (because backslash is part of the line and should not be unescaped):

/opt/ltp/testcases/bin/cpuset_funcs.sh:line178:
/dev/cpuset/machine.slice/machine-qemux2d157x2dzhx2dsxf.scope/vcpu7/tasks:
The file or directory is not available
rmdir: delete
'/dev/cpuset/machine.slice/machine-qemux2d157x2dzhx2dsxf.scope/vcpu7'
Failure: The file or directory is not available
cpuset_memory_pressure 1 TFAIL: Couldn't remove subdir -
/opt/ltp/testcases/bin/cpuset_funcs.sh:line178:
/dev/cpuset/machine.slice/machine-qemux2d157x2dzhx2dsxf.scope/vcpu7/tasks:
The file or directory is not available
rmdir: delete
'/dev/cpuset/machine.slice/machine-qemux2d157x2dzhx2dsxf.scope/vcpu7'
Failure: The file or directory is not available
cpuset_memory_pressure 1 TFAIL: Couldn't remove subdir -

Link: https://lore.kernel.org/ltp/[email protected]/
Reviewed-by: Petr Vorel <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>
Signed-off-by: Hao Zeng <[email protected]>
[ pvorel: reword commit log ]
Signed-off-by: Petr Vorel <[email protected]>

Author: Hao Zeng

testcases/kernel/controllers/cpuctl_fj/run_cpuctl_test_fj.sh

@@ -63,7 +63,7 @@ cleanup()
 		return 0
 	}
 
-	find $CPUCTL -type d | sort | sed -n '2,$p' | tac | while read tmpdir
+	find $CPUCTL -type d | sort | sed -n '2,$p' | tac | while read -r tmpdir
 	do
 		while read tmppid
 		do

testcases/kernel/controllers/cpuset/cpuset_funcs.sh

@@ -184,7 +184,7 @@ cleanup()
 	echo $CHILDREN_VALUE > $CLONE_CHILDREN
 	echo $SCHED_LB_VALUE > $SCHED_LB
 
-	find "$CPUSET" -type d | sort | sed -n '2,$p' | tac | while read subdir
+	find "$CPUSET" -type d | sort | sed -n '2,$p' | tac | while read -r subdir
 	do
 		while read pid
 		do