r300g: avoid the use of goto

I was being lazy on Sunday morning, Droste on irc called me on it ;-)
diff --git a/src/gallium/drivers/r300/r300_emit.c b/src/gallium/drivers/r300/r300_emit.c
index e08e6c2..e07185b 100644
--- a/src/gallium/drivers/r300/r300_emit.c
+++ b/src/gallium/drivers/r300/r300_emit.c
@@ -1105,10 +1105,8 @@
     /* Make sure we have at least 2*1024 spare dwords. */
     /* XXX It would be nice to know the number of dwords we really need to
      * XXX emit. */
-again:
-    if (!r300->winsys->check_cs(r300->winsys, dwords)) {
+    while (!r300->winsys->check_cs(r300->winsys, dwords)) {
         r300->context.flush(&r300->context, 0, NULL);
-	goto again;
     }
 
     if (r300->dirty_state & R300_NEW_QUERY) {