Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c
index 7980ec0..67f6c3b 100644
--- a/arch/powerpc/kernel/rtasd.c
+++ b/arch/powerpc/kernel/rtasd.c
@@ -465,7 +465,7 @@
 	pr_debug("rtasd: will sleep for %d milliseconds\n",
 		 (30000 / rtas_event_scan_rate));
 
-	/* Retreive errors from nvram if any */
+	/* Retrieve errors from nvram if any */
 	retreive_nvram_error_log();
 
 	schedule_delayed_work_on(cpumask_first(cpu_online_mask),