refactor: reduce scope of locals as per the style guide (#22206)

src/nvim/mapping.c

@@ -1434,15 +1434,11 @@ int ExpandMappings(char *pat, regmatch_T *regmatch, int *numMatches, char ***mat
 // Return true if there is an abbreviation, false if not.
 bool check_abbr(int c, char *ptr, int col, int mincol)
 {
-  int len;
   int scol;                     // starting column of the abbr.
-  int j;
-  char *s;
   char_u tb[MB_MAXBYTES + 4];
   mapblock_T *mp;
   mapblock_T *mp2;
   int clen = 0;                 // length in characters
-  bool is_id = true;
 
   if (typebuf.tb_no_abbr_cnt) {  // abbrev. are not recursive
     return false;
@@ -1462,6 +1458,7 @@ bool check_abbr(int c, char *ptr, int col, int mincol)
   }
 
   {
+    bool is_id = true;
     bool vim_abbr;
     char *p = mb_prevptr(ptr, ptr + col);
     if (!vim_iswordp(p)) {
@@ -1489,7 +1486,7 @@ bool check_abbr(int c, char *ptr, int col, int mincol)
   }
   if (scol < col) {             // there is a word in front of the cursor
     ptr += scol;
-    len = col - scol;
+    int len = col - scol;
     mp = curbuf->b_first_abbr;
     mp2 = first_abbr;
     if (mp == NULL) {
@@ -1532,7 +1529,7 @@ bool check_abbr(int c, char *ptr, int col, int mincol)
       //
       // Character CTRL-] is treated specially - it completes the
       // abbreviation, but is not inserted into the input stream.
-      j = 0;
+      int j = 0;
       if (c != Ctrl_RSB) {
         // special key code, split up
         if (IS_SPECIAL(c) || c == K_SPECIAL) {
@@ -1568,6 +1565,7 @@ bool check_abbr(int c, char *ptr, int col, int mincol)
       const bool silent = mp->m_silent;
       const bool expr = mp->m_expr;
 
+      char *s;
       if (expr) {
         s = eval_map_expr(mp, c);
       } else {