read_raw_ref(): rename flags argument to type

This will hopefully reduce confusion with the "flags" arguments that are
used in many functions in this module as an input parameter to choose
how the function should operate.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>

refs/refs-internal.h

@@ -210,6 +210,6 @@ int do_for_each_ref(const char *submodule, const char *base,
 		    each_ref_fn fn, int trim, int flags, void *cb_data);
 
 int read_raw_ref(const char *refname, unsigned char *sha1,
-		 struct strbuf *symref, unsigned int *flags);
+		 struct strbuf *symref, unsigned int *type);
 
 #endif /* REFS_REFS_INTERNAL_H */