inlined stack pointer retrieval to silence compiler warning

src/stackcheck.cc

@@ -15,12 +15,14 @@ StackCheck::~StackCheck()
 
 void StackCheck::init()
 {
-    ptr = sp();
+	unsigned char c;
+	ptr = &c;
 }
 
 unsigned long StackCheck::size()
 {
-    return std::labs(ptr - sp());
+	unsigned char c;
+	return std::labs(ptr - &c);
 }
 
 bool StackCheck::check()

src/stackcheck.h

@@ -13,8 +13,6 @@ public:
     unsigned long size();
     
 private:
-    unsigned char * sp() { unsigned char c; return &c; };
-    
     unsigned char * ptr;
     
     static StackCheck *self;