crypto: scompress - initialize per-CPU variables on each CPU

In commit 71052dcf ("crypto: scompress - Use per-CPU struct instead
multiple variables") I accidentally initialized multiple times the memory on a
random CPU. I should have initialize the memory on every CPU like it has
been done earlier. I didn't notice this because the scheduler didn't
move the task to another CPU.
Guenter managed to do that and the code crashed as expected.

Allocate / free per-CPU memory on each CPU.

Fixes: 71052dcf ("crypto: scompress - Use per-CPU struct instead multiple variables")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/scompress.c

@@ -76,7 +76,7 @@ static void crypto_scomp_free_scratches(void)
 	int i;
 
 	for_each_possible_cpu(i) {
-		scratch = raw_cpu_ptr(&scomp_scratch);
+		scratch = per_cpu_ptr(&scomp_scratch, i);
 
 		vfree(scratch->src);
 		vfree(scratch->dst);
@@ -93,7 +93,7 @@ static int crypto_scomp_alloc_scratches(void)
 	for_each_possible_cpu(i) {
 		void *mem;
 
-		scratch = raw_cpu_ptr(&scomp_scratch);
+		scratch = per_cpu_ptr(&scomp_scratch, i);
 
 		mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
 		if (!mem)