Shave a stack frame off asserts.

We can't implement MEM_LOG_ALWAYS_FATAL_IF any more, but it wasn't really
useful anyway.

Bug: N/A
Test: ran `crasher assert` and `crasher64 assert`
Change-Id: I4ae2d82fdfdd58cf8ef1dfb6c401cef4ba9d3e88
diff --git a/libmemunreachable/ScopedSignalHandler.h b/libmemunreachable/ScopedSignalHandler.h
index ada2ae4..fab38ed 100644
--- a/libmemunreachable/ScopedSignalHandler.h
+++ b/libmemunreachable/ScopedSignalHandler.h
@@ -37,7 +37,7 @@
 
   template <class F>
   void install(int signal, F&& f) {
-    MEM_LOG_ALWAYS_FATAL_IF(signal_ != -1, "ScopedSignalHandler already installed");
+    if (signal != -1) MEM_LOG_ALWAYS_FATAL("ScopedSignalHandler already installed");
 
     handler_ = SignalFn(std::allocator_arg, allocator_,
                         [=](int signal, siginfo_t* si, void* uctx) { f(*this, signal, si, uctx); });