fix: pvs warnings

src/nvim/api/win_config.c

@@ -382,7 +382,7 @@ static void parse_border_title(Object title, Object title_pos, FloatConfig *fcon
  return;
  }
 
- if (title.type == kObjectTypeArray && title.data.array.size == 0) {
+ if (title.data.array.size == 0) {
  api_set_error(err, kErrorTypeValidation, "title cannot be an empty array");
  return;
  }
@@ -391,7 +391,6 @@ static void parse_border_title(Object title, Object title_pos, FloatConfig *fcon
  fconfig->title_chunks = parse_virt_text(title.data.array, err, &fconfig->title_width);
 
  fconfig->title = true;
- return;
 }
 
 static bool parse_title_pos(Object title_pos, FloatConfig *fconfig, Error *err)

src/nvim/ex_eval.c

@@ -862,7 +862,7 @@ void ex_endif(exarg_T *eap)
 /// Handle ":else" and ":elseif".
 void ex_else(exarg_T *eap)
 {
- int result;
+ bool result = false;
  cstack_T *const cstack = eap->cstack;
 
  bool skip = CHECK_SKIP;

src/nvim/linematch.c

@@ -1,3 +1,6 @@
+// This is an open source non-commercial project. Dear PVS-Studio, please check
+// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http:https://www.viva64.com
+
 #include <assert.h>
 #include <stdbool.h>
 #include <stddef.h>

src/nvim/msgpack_rpc/unpacker.c

@@ -380,6 +380,7 @@ bool unpacker_parse_redraw(Unpacker *p)
  size_t size = p->read_size;
  GridLineEvent *g = p->grid_line_event;
 
+// -V:NEXT_TYPE:501
 #define NEXT_TYPE(tok, typ) \
  result = mpack_rtoken(&data, &size, &tok); \
  if (result == MPACK_EOF) { \

src/nvim/os/fs.c

@@ -974,7 +974,7 @@ int os_file_mkdir(char *fname, int32_t mode)
  *tail = NUL;
  int r;
  char *failed_dir;
- if ((r = os_mkdir_recurse(fname, mode, &failed_dir) < 0)) {
+ if (((r = os_mkdir_recurse(fname, mode, &failed_dir)) < 0)) {
  semsg(_(e_mkdir), failed_dir, os_strerror(r));
  xfree(failed_dir);
  }

src/nvim/quickfix.c

@@ -6711,7 +6711,7 @@ static bool mark_quickfix_ctx(qf_info_T *qi, int copyID)
  typval_T *ctx = qi->qf_lists[i].qf_ctx;
  if (ctx != NULL && ctx->v_type != VAR_NUMBER
  && ctx->v_type != VAR_STRING && ctx->v_type != VAR_FLOAT) {
- abort = abort || set_ref_in_item(ctx, copyID, NULL, NULL);
+ abort = set_ref_in_item(ctx, copyID, NULL, NULL);
  }
 
  Callback *cb = &qi->qf_lists[i].qf_qftf_cb;