Linux SPL module init: Handle memory allocation failures correctly

Upon inspection of our code, I noticed that we assume that
__alloc_percpu() cannot fail, and while it probably never has failed in
practice, technically, it can fail, so we should handle that.

Additionally, we incorrectly assume that `taskq_create()` in
spl_kmem_cache_init() cannot fail. The same remark applies to it.

Lastly, `spl-init()` failures should always return negative error
values, but in some places, we are returning positive 1, which is
incorrect. We change those values to their correct error codes.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #13847

module/os/linux/spl/spl-tsd.c

@@ -706,7 +706,7 @@ spl_tsd_init(void)
 {
 	tsd_hash_table = tsd_hash_table_init(TSD_HASH_TABLE_BITS_DEFAULT);
 	if (tsd_hash_table == NULL)
-		return (1);
+		return (-ENOMEM);
 
 	return (0);
 }