fix seg fault with simple typedef struct

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@7651 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/common.mk

@@ -290,6 +290,7 @@ CPP_TEST_CASES += \
 	typedef_mptr \
 	typedef_reference \
 	typedef_scope \
+	typedef_struct \
 	typemap_namespace \
 	typemap_ns_using \
 	typemap_numinputs \

SWIG/Examples/test-suite/typedef_struct.i

@@ -0,0 +1,9 @@
+%module typedef_struct
+
+%inline {
+  typedef struct {
+    int numpoints;
+  } lineObj;
+  
+  typedef lineObj multipointObj;
+}

SWIG/Source/Swig/symbol.c

@@ -586,7 +586,9 @@ Swig_symbol_cadd(String_or_char *name, Node *n) {
 	 
       */
       if (td1 && checkAttribute(td1,k_storage,k_typedef)) {
-	if (Strcmp(Getattr(td1,k_type), Getattr(td,k_name)) == 0) {
+	String *st = Getattr(td1,k_type);
+	String *sn = Getattr(td,k_name);
+	if (st && sn && (Strcmp(st, sn) == 0)) {
 	  Symtab *sc = parentNode(current_symtab);
 	  if (sc) td1 = Swig_symbol_clookup(type,sc);
 	}