tweaks: rename a symbol, and actually use it where it is needed

src/nano.h

@@ -32,9 +32,9 @@
 #ifdef __TANDEM
 /* Tandem NonStop Kernel support. */
 #include <floss.h>
-#define NANO_ROOT_UID 65535
+#define ROOT_UID  65535
 #else
-#define NANO_ROOT_UID 0
+#define ROOT_UID  0
 #endif
 
 #ifdef HAVE_LIMITS_H

src/utils.c

@@ -38,7 +38,7 @@ void get_homedir(void)
 #ifdef HAVE_PWD_H
 		/* When HOME isn't set, or when we're root, get the home directory
 		 * from the password file instead. */
-		if (homenv == NULL || geteuid() == 0) {
+		if (homenv == NULL || geteuid() == ROOT_UID) {
 			const struct passwd *userage = getpwuid(geteuid());
 
 			if (userage != NULL)