Error out if memory allocation for context fails

Author: mgreter

src/sass_context.cpp

@@ -330,7 +330,9 @@ extern "C" {
       c_ctx->error_column = std::string::npos;
 
       // allocate a new compiler instance
-      Sass_Compiler* compiler = (struct Sass_Compiler*) calloc(1, sizeof(struct Sass_Compiler));
+      void* ctxmem = calloc(1, sizeof(struct Sass_Compiler));
+      if (ctxmem == 0) { std::cerr << "Error allocating memory for context" << std::endl; return 0; }
+      Sass_Compiler* compiler = (struct Sass_Compiler*) ctxmem;
       compiler->state = SASS_COMPILER_CREATED;
 
       // store in sass compiler