fix syscall error detection bug

clibs/chibrax/syscall.cc

@@ -64,7 +64,7 @@ namespace syscallNode {
         }
 
         freeList(memoryToClean);
-        if(syscallReturnValue = -1) {
+        if(syscallReturnValue == -1) {
             returnjs(errno);
         }
     }