coredumpctl: cleanup use of ERRNO_IS_PRIVILEGE()

Given that ERRNO_IS_PRIVILEGE() also matches positive values,
make sure this macro is not called with arguments that do not have
errno semantics.

In this case the argument passed to ERRNO_IS_PRIVILEGE() is the value
returned by access_fd() which is not expected to return any positive
values, but let's be consistent anyway and move the ERRNO_IS_PRIVILEGE()
invocation to the branch where the return value is known to be negative.

src/coredump/coredumpctl.c

@@ -483,14 +483,15 @@ static void analyze_coredump_file(
                 r = -errno;
         } else
                 r = access_fd(fd, R_OK);
-        if (ERRNO_IS_PRIVILEGE(r)) {
-                *ret_state = "inaccessible";
-                *ret_color = ansi_highlight_yellow();
-                *ret_size = UINT64_MAX;
-                return;
-        }
-        if (r < 0)
+        if (r < 0) {
+                if (ERRNO_IS_PRIVILEGE(r)) {
+                        *ret_state = "inaccessible";
+                        *ret_color = ansi_highlight_yellow();
+                        *ret_size = UINT64_MAX;
+                        return;
+                }
                 goto error;
+        }
 
         if (fstat(fd, &st) < 0)
                 goto error;