Global cleanup: Fix a few spelling errors

Just a trivial patch to fix a few errors found by codespell.

Here's the command I used:
codespell -S subprojects,out \
-L fwe,dout,tast,crate,parms,claus,nt,nd,te,truns,trun

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I4e3b277f220fa70dcab21912c30f1d26d9bd8749
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/62840
Original-Reviewed-by: Felix Singer <felixsinger@posteo.net>
Original-Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
diff --git a/flashrom.c b/flashrom.c
index f5fcae4..caee351 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -606,7 +606,7 @@
 	return first_len;
 }
 
-/* Returns the number of busses commonly supported by the current programmer and flash chip where the latter
+/* Returns the number of buses commonly supported by the current programmer and flash chip where the latter
  * can not be completely accessed due to size/address limits of the programmer. */
 unsigned int count_max_decode_exceedings(const struct flashctx *flash)
 {