lib/chkname.c: is_valid_name(): Use ispfchar_c() to simplify

In the first case, we can do the transformation because a few lines
above, we explicitly reject a name starting with a '-'.

In the second case, we're obviously using ispfchar_c() instead of its
pattern.

Signed-off-by: Alejandro Colomar <alx@kernel.org>

Author: alejandro-colomar

lib/chkname.c

@@ -33,6 +33,7 @@
 
 #include "defines.h"
 #include "chkname.h"
+#include "string/ctype/isascii.h"
 #include "string/ctype/strchrisascii.h"
 #include "string/ctype/strisascii.h"
 #include "string/strcmp/streq.h"
@@ -87,10 +88,7 @@ is_valid_name(const char *name)
 	 * sake of Samba 3.x "add machine script"
 	 */
 
-	if (!(isalnum(*name) ||
-	      *name == '_' ||
-	      *name == '.'))
-	{
+	if (!ispfchar_c(*name)) {
 		errno = EILSEQ;
 		return false;
 	}
@@ -99,12 +97,7 @@ is_valid_name(const char *name)
 		if (streq(name, "$"))  // Samba
 			return true;
 
-		if (!(isalnum(*name) ||
-		      *name == '_' ||
-		      *name == '.' ||
-		      *name == '-'
-		     ))
-		{
+		if (!ispfchar_c(*name)) {
 			errno = EILSEQ;
 			return false;
 		}