Minor style cleanup

Resolve an assortment of style inconsistencies including
use of white space, typos, capitalization, and line wrapping.
There is no functional change.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9030

module/spl/spl-thread.c

@@ -153,8 +153,9 @@ spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...)
 			if (PTR_ERR(tsk) == -ENOMEM)
 				continue;
 			return (NULL);
-		} else
+		} else {
 			return (tsk);
+		}
 	} while (1);
 }
 EXPORT_SYMBOL(spl_kthread_create);