Remove superfluous newline character

Remove superfluous `newline` character from spl_kmem_cache_magazine_size
module parameter description.

Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#499

module/spl/spl-kmem-cache.c

@@ -87,7 +87,7 @@ MODULE_PARM_DESC(spl_kmem_cache_expire, "By age (0x1) or low memory (0x2)");
 unsigned int spl_kmem_cache_magazine_size = 0;
 module_param(spl_kmem_cache_magazine_size, uint, 0444);
 MODULE_PARM_DESC(spl_kmem_cache_magazine_size,
-	"Default magazine size (2-256), set automatically (0)\n");
+	"Default magazine size (2-256), set automatically (0)");
 
 /*
  * The default behavior is to report the number of objects remaining in the