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/bb43c[e-mail]
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/dhry_1.c

···
 	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);