efi_loader: typo in function description of u16_strnlen

%/u16_strlen/u16_strnlen()/

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/charset.h b/include/charset.h
index 5564f3b..cc650a2 100644
--- a/include/charset.h
+++ b/include/charset.h
@@ -219,7 +219,7 @@
 size_t u16_strsize(const void *in);
 
 /**
- * u16_strlen - count non-zero words
+ * u16_strnlen() - count non-zero words
  *
  * This function matches wscnlen_s() if the -fshort-wchar compiler flag is set.
  * In the EFI context we explicitly need a function handling u16 strings.