Fix off by one error.

Change-Id: I18a2d177f3212626b7091150f42dfe151e47570e
diff --git a/libunwindstack/RegsInfo.h b/libunwindstack/RegsInfo.h
index e6dd33c..e445a91 100644
--- a/libunwindstack/RegsInfo.h
+++ b/libunwindstack/RegsInfo.h
@@ -41,7 +41,7 @@
   }
 
   inline AddressType* Save(uint32_t reg) {
-    if (reg > MAX_REGISTERS) {
+    if (reg >= MAX_REGISTERS) {
       // This should never happen since all currently supported
       // architectures have < 64 total registers.
       abort();