lib: dhry: use ktime_ms_delta() helper

Use the existing ktime_ms_delta() helper instead of open-coding the same
operation.

Link: https://lkml.kernel.org/r/bb43c67a7580de6152f5e6eb225071166d33b6e4.1705934853.git.geert+renesas@glider.be
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: geertu

lib/dhry_1.c

@@ -277,7 +277,7 @@ int dhry(int n)
 	dhry_assert_string_eq(Str_1_Loc, "DHRYSTONE PROGRAM, 1'ST STRING");
 	dhry_assert_string_eq(Str_2_Loc, "DHRYSTONE PROGRAM, 2'ND STRING");
 
-	User_Time = ktime_to_ms(ktime_sub(End_Time, Begin_Time));
+	User_Time = ktime_ms_delta(End_Time, Begin_Time);
 
 	kfree(Ptr_Glob);
 	kfree(Next_Ptr_Glob);