chase-symlinks: Rename chase_symlinks() to chase()

Chasing symlinks is a core function that's used in a lot of places
so it deservers a less verbose names so let's rename it to chase()
and chaseat().

We also slightly change the pattern used for the chaseat() helpers
so we get chase_and_openat() and similar.

src/basic/devnum-util.c

@@ -3,7 +3,7 @@
 #include <string.h>
 #include <sys/stat.h>
 
-#include "chase-symlinks.h"
+#include "chase.h"
 #include "devnum-util.h"
 #include "parse-util.h"
 #include "path-util.h"
@@ -92,7 +92,7 @@ int device_path_make_canonical(mode_t mode, dev_t devnum, char **ret) {
         if (r < 0)
                 return r;
 
-        return chase_symlinks(p, NULL, 0, ret, NULL);
+        return chase(p, NULL, 0, ret, NULL);
 }
 
 int device_path_parse_major_minor(const char *path, mode_t *ret_mode, dev_t *ret_devnum) {