Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/mips/lib/strnlen_user.S b/arch/mips/lib/strnlen_user.S
index c768e300..6445716 100644
--- a/arch/mips/lib/strnlen_user.S
+++ b/arch/mips/lib/strnlen_user.S
@@ -17,7 +17,7 @@
 	.previous
 
 /*
- * Return the size of a string including the ending NUL character upto a
+ * Return the size of a string including the ending NUL character up to a
  * maximum of a1 or 0 in case of error.
  *
  * Note: for performance reasons we deliberately accept that a user may