delete_module01: Cleanup style

* remove unused import
* join string to be on single line
* use C style comparison in if
* reuse constant

Signed-off-by: Petr Vorel <pvorel@suse.cz>

testcases/kernel/syscalls/delete_module/delete_module01.c

@@ -14,27 +14,27 @@
  * Install dummy_del_mod.ko and delete it with delete_module(2).
  */
 
-#include <errno.h>
 #include "tst_test.h"
 #include "tst_module.h"
 #include "lapi/syscalls.h"
 
 #define MODULE_NAME	"dummy_del_mod"
-#define MODULE_NAME_KO	"dummy_del_mod.ko"
+#define MODULE_NAME_KO	MODULE_NAME ".ko"
 
 static int module_loaded;
 
 static void do_delete_module(void)
 {
-	if (module_loaded == 0) {
+	if (!module_loaded) {
 		tst_module_load(MODULE_NAME_KO, NULL);
 		module_loaded = 1;
 	}
 
 	TEST(tst_syscall(__NR_delete_module, MODULE_NAME, 0));
 	if (TST_RET == -1) {
-		tst_res(TFAIL | TTERRNO, "delete_module() failed to "
-			"remove module entry for %s ", MODULE_NAME);
+		tst_res(TFAIL | TTERRNO,
+			"delete_module() failed to remove module entry for %s",
+			MODULE_NAME);
 		return;
 	}
 
@@ -44,7 +44,7 @@ static void do_delete_module(void)
 
 static void cleanup(void)
 {
-	if (module_loaded == 1)
+	if (module_loaded)
 		tst_module_unload(MODULE_NAME_KO);
 }