Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/media/dvb/frontends/drx397xD.c b/drivers/media/dvb/frontends/drx397xD.c
index a05007c..536f02b 100644
--- a/drivers/media/dvb/frontends/drx397xD.c
+++ b/drivers/media/dvb/frontends/drx397xD.c
@@ -1097,7 +1097,7 @@
 	s->config.ifagc.w0A = 0x3ff;
 	s->config.ifagc.w0C = 0x388;
 
-	/* for signal strenght calculations */
+	/* for signal strength calculations */
 	s->config.ss76 = 820;
 	s->config.ss78 = 2200;
 	s->config.ss7A = 150;