process.c: ix typo

* process.c (USE_GETPWNAM_R): fix typo.  _SC_GETPW_R_SIZE_MAX instead
  of same macro twice.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39146 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

process.c

@@ -145,7 +145,7 @@ static void check_gid_switch(void);
 #endif
 
 #if defined(HAVE_PWD_H)
-# if defined(HAVE_GETPWNAM_R) && defined(HAVE_GETPWNAM_R)
+# if defined(HAVE_GETPWNAM_R) && defined(_SC_GETPW_R_SIZE_MAX)
 #  define USE_GETPWNAM_R 1
 # endif
 # ifdef USE_GETPWNAM_R