Avoid type punning on pointers to values.
Leave type punning on values.

https://gcc.gnu.org/PR97264
https://sourceware.org/PR26690
--- a/stdio-common/vfscanf-internal.c
+++ b/stdio-common/vfscanf-internal.c
@@ -486,7 +486,9 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
       /* Check for a positional parameter specification.  */
       if (ISDIGIT ((UCHAR_T) *f))
 	{
-	  argpos = read_int ((const UCHAR_T **) &f);
+	  const UCHAR_T * uf = (void*)f;
+	  argpos = read_int (&uf);
+	  f = (void*)uf;
 	  if (*f == L_('$'))
 	    ++f;
 	  else
@@ -521,8 +523,11 @@ __vfscanf_internal (FILE *s, const char *format, va_list argptr,
 
       /* Find the maximum field width.  */
       width = 0;
-      if (ISDIGIT ((UCHAR_T) *f))
-	width = read_int ((const UCHAR_T **) &f);
+      if (ISDIGIT ((UCHAR_T) *f)) {
+	const UCHAR_T * uf = (void*)f;
+	width = read_int (&uf);
+	f = (void*)uf;
+      }
     got_width:
       if (width == 0)
 	width = -1;