lib9/create.c: delete unused variable
fixes build with GCC4.6

R=adg
CC=golang-dev
https://golang.org/cl/4396048
diff --git a/src/lib9/create.c b/src/lib9/create.c
index 59845ba..d7023ae 100644
--- a/src/lib9/create.c
+++ b/src/lib9/create.c
@@ -37,9 +37,8 @@
 int
 p9create(char *path, int mode, ulong perm)
 {
-	int fd, umode, rclose, rdwr;
+	int fd, umode, rclose;
 
-	rdwr = mode&3;
 	rclose = mode&ORCLOSE;
 	mode &= ~ORCLOSE;