Port member initialization from constructor to declaration (C++11)

Using `clang-tidy`'s `modernize-use-default-member-init` check and
manual review of the changes, and some extra manual changes that
`clang-tidy` failed to do.

Also went manually through all of `core` to find occurrences that
`clang-tidy` couldn't handle, especially all initializations done
in a constructor without using initializer lists.

1 files changed, 4 insertions, 8 deletions

diff --git a/core/error_macros.h b/core/error_macros.h
index 83f92129a5..eb2cc5215d 100644
--- a/core/error_macros.h
+++ b/core/error_macros.h
@@ -48,16 +48,12 @@ typedef void (*ErrorHandlerFunc)(void *, const char *, const char *, int p_line,
 
 struct ErrorHandlerList {
 
-	ErrorHandlerFunc errfunc;
-	void *userdata;
+	ErrorHandlerFunc errfunc = nullptr;
+	void *userdata = nullptr;
 
-	ErrorHandlerList *next;
+	ErrorHandlerList *next = nullptr;
 
-	ErrorHandlerList() {
-		errfunc = 0;
-		next = 0;
-		userdata = 0;
-	}
+	ErrorHandlerList() {}
 };
 
 void add_error_handler(ErrorHandlerList *p_handler);