vsnprintf: Drop unused const char fmt * in va_format()

va_format() doesn't use original formatting string, drop that
argument as it's done elsewhere in similar cases.

Suggested-by: Rasmus Villemoes <ravi@prevas.dk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20250321144822.324050-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Petr Mladek <pmladek@suse.com>

Author: andy-shev

lib/vsprintf.c

@@ -1700,7 +1700,7 @@ char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
 }
 
 static char *va_format(char *buf, char *end, struct va_format *va_fmt,
-		       struct printf_spec spec, const char *fmt)
+		       struct printf_spec spec)
 {
 	va_list va;
 
@@ -2469,7 +2469,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 	case 'U':
 		return uuid_string(buf, end, ptr, spec, fmt);
 	case 'V':
-		return va_format(buf, end, ptr, spec, fmt);
+		return va_format(buf, end, ptr, spec);
 	case 'K':
 		return restricted_pointer(buf, end, ptr, spec);
 	case 'N':