build: enable -Wshadow

Note about shada.c:
- shada_read_next_item_start was intentionally shadowing `unpacked` and
  `i` because many of the macros (e.g. ADDITIONAL_KEY) implicitly
  depended on those variable names.
- Macros were changed to parameterize `unpacked` (but not `i`). Macros
  like CLEAR_GA_AND_ERROR_OUT do control-flow (goto), so any other
  approach is messy.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/nvim/tui/input.c b/src/nvim/tui/input.c
index 0362820687..a0df80a8e8 100644
--- a/src/nvim/tui/input.c
+++ b/src/nvim/tui/input.c
@@ -352,8 +352,8 @@ static bool handle_forced_escape(TermInput *input)
   return false;
 }
 
-static void read_cb(Stream *stream, RBuffer *buf, size_t c, void *data,
-    bool eof)
+static void read_cb(Stream *stream, RBuffer *buf, size_t count_, void *data,
+                    bool eof)
 {
   TermInput *input = data;