don't use AESNI if not supported

Makefile.linux

@@ -34,7 +34,7 @@ IS_64 := $(shell $(CXX) -dumpmachine 2>&1 | $(GREP) -c "64")
 ifeq ($(USE_AESNI),yes)
 ifeq ($(IS_64),1)
 #check if AES-NI is supported by CPU
-ifneq ($(shell $(GREP) -c aes /proc/cpuinfo),1)
+ifneq ($(shell $(GREP) -c aes /proc/cpuinfo),0)
   CXXFLAGS += -maes -DAESNI
 else
   $(warning "AESNI support enabled requested but not supported by this CPU")