crypto: drbg - kzfree does not need a check for NULL pointer

The kzfree function already performs the NULL pointer check. Therefore,
the DRBG code does not need to implement such check.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/drbg.c

@@ -1153,8 +1153,7 @@ static int drbg_seed(struct drbg_state *drbg, struct drbg_string *pers,
 	drbg->reseed_ctr = 1;
 
 out:
-	if (entropy)
-		kzfree(entropy);
+	kzfree(entropy);
 	return ret;
 }
 
@@ -1163,19 +1162,15 @@ static inline void drbg_dealloc_state(struct drbg_state *drbg)
 {
 	if (!drbg)
 		return;
-	if (drbg->V)
-		kzfree(drbg->V);
+	kzfree(drbg->V);
 	drbg->V = NULL;
-	if (drbg->C)
-		kzfree(drbg->C);
+	kzfree(drbg->C);
 	drbg->C = NULL;
-	if (drbg->scratchpad)
-		kzfree(drbg->scratchpad);
+	kzfree(drbg->scratchpad);
 	drbg->scratchpad = NULL;
 	drbg->reseed_ctr = 0;
 #ifdef CONFIG_CRYPTO_FIPS
-	if (drbg->prev)
-		kzfree(drbg->prev);
+	kzfree(drbg->prev);
 	drbg->prev = NULL;
 	drbg->fips_primed = false;
 #endif
@@ -1295,8 +1290,7 @@ static int drbg_make_shadow(struct drbg_state *drbg, struct drbg_state **shadow)
 	return 0;
 
 err:
-	if (tmp)
-		kzfree(tmp);
+	kzfree(tmp);
 	return ret;
 }