resample: add missing constraint for register q9

Change-Id: Ia9cc31f591af574aeea007f934c09c9e1415984d
diff --git a/libspeex/resample_neon.h b/libspeex/resample_neon.h
index 8a97429..b651d5d 100644
--- a/libspeex/resample_neon.h
+++ b/libspeex/resample_neon.h
@@ -181,7 +181,7 @@
 		    [len] "+l" (len), [remainder] "+l" (remainder)
 		  :
 		  : "cc", "q0", "q1", "q2", "q3", "q4", "q5", "q6", "q7", "q8",
-		    "q10", "q11");
+		    "q9", "q10", "q11");
     return ret;
 }