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/zcommon/zfs_fletcher.c

@@ -595,8 +595,9 @@ fletcher_4_incremental_byteswap(void *buf, size_t size, void *data)
 }
 
 #if defined(_KERNEL)
-/* Fletcher 4 kstats */
-
+/*
+ * Fletcher 4 kstats
+ */
 static int
 fletcher_4_kstat_headers(char *buf, size_t size)
 {
@@ -673,7 +674,6 @@ fletcher_4_benchmark_impl(boolean_t native, char *data, uint64_t data_size)
 	zio_cksum_t zc;
 	uint32_t i, l, sel_save = IMPL_READ(fletcher_4_impl_chosen);
 
-
 	fletcher_checksum_func_t *fletcher_4_test = native ?
 	    fletcher_4_native : fletcher_4_byteswap;