selftests/resctrl: fix spelling mistake "Errror" -> "Error"

There are two spelling mistakes in error messages. Fix these.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/resctrl/fill_buf.c

···
 		ret = fill_cache_write(start_ptr, end_ptr, resctrl_val);
 
 	if (ret) {
-		printf("\n Errror in fill cache read/write...\n");
+		printf("\n Error in fill cache read/write...\n");
 		return -1;
 	}
 
···
 	ret = fill_cache(cache_size, malloc_and_init_memory, memflush, op,
 			 resctrl_val);
 	if (ret) {
-		printf("\n Errror in fill cache\n");
+		printf("\n Error in fill cache\n");
 		return -1;
 	}