maint: remove unnecessary casts before using gnulib functions

* src/parse-gram.y, src/scan-gram.l: Do not cast c-ctype.h function
args to unsigned char unnecessarily.
* src/parse-gram.c: Regenerate.

Copyright-paperwork-exempt: yes

src/parse-gram.c

@@ -2945,11 +2945,11 @@ add_param (param_type type, char *decl, location loc)
     /* Strip the surrounding '{' and '}', and any blanks just inside
        the braces.  */
     --p;
-    while (c_isspace ((unsigned char) *p))
+    while (c_isspace (*p))
       --p;
     p[1] = '\0';
     ++decl;
-    while (c_isspace ((unsigned char) *decl))
+    while (c_isspace (*decl))
       ++decl;
   }
 

src/parse-gram.y

@@ -928,11 +928,11 @@ add_param (param_type type, char *decl, location loc)
     /* Strip the surrounding '{' and '}', and any blanks just inside
        the braces.  */
     --p;
-    while (c_isspace ((unsigned char) *p))
+    while (c_isspace (*p))
       --p;
     p[1] = '\0';
     ++decl;
-    while (c_isspace ((unsigned char) *decl))
+    while (c_isspace (*decl))
       ++decl;
   }
 

src/scan-gram.l

@@ -683,7 +683,7 @@ eqopt    ({sp}=)?
   \\(.|{eol})      {
     char const *p = yytext + 1;
     /* Quote only if escaping won't make the character visible.  */
-    if (c_isspace ((unsigned char) *p) && c_isprint ((unsigned char) *p))
+    if (c_isspace (*p) && c_isprint (*p))
       p = quote (p);
     else
       p = quotearg_style_mem (escape_quoting_style, p, 1);