83xx: mpc8315erdb: fix silly thinko in fdt_tsec1_fixup

The thinko was quite silly indeed, I messed with !ptr. Normally this
would trigger some fault, but in U-Boot NULL pointer is equal to phys
0, so the code was working still, just didn't actually test mpc8315erdb
environment variable value. Heh.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

board/freescale/mpc8315erdb/mpc8315erdb.c

@@ -128,15 +128,16 @@ void fdt_tsec1_fixup(void *fdt, bd_t *bd)
 	const char *path;
 	int ret;
 
-	if (!mpc8315erdb) {
-		if (!strcmp(mpc8315erdb, "tsec1")) {
-			return;
-		} else if (strcmp(mpc8315erdb, "ulpi")) {
-			printf("WARNING: wrong `mpc8315erdb' environment "
-			       "variable specified: `%s'. Should be `ulpi' "
-			       "or `tsec1'.\n", mpc8315erdb);
-			return;
-		}
+	if (!mpc8315erdb)
+		return;
+
+	if (!strcmp(mpc8315erdb, "tsec1")) {
+		return;
+	} else if (strcmp(mpc8315erdb, "ulpi")) {
+		printf("WARNING: wrong `mpc8315erdb' environment "
+		       "variable specified: `%s'. Should be `ulpi' "
+		       "or `tsec1'.\n", mpc8315erdb);
+		return;
 	}
 
 	ret = fdt_path_offset(fdt, "/aliases");