libpayload/libpci: Clean up pci_alloc()

Clean up pci_alloc() and return pointer to allocated memory directly.

Change-Id: Ib2ee8dbfaabbf7a824b4fd75ad7c779393af2900
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46345
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/payloads/libpayload/libpci/libpci.c b/payloads/libpayload/libpci/libpci.c
index 27347e3..3e3513c 100644
--- a/payloads/libpayload/libpci/libpci.c
+++ b/payloads/libpayload/libpci/libpci.c
@@ -72,8 +72,7 @@
 
 struct pci_access *pci_alloc(void)
 {
-	struct pci_access *pacc = malloc(sizeof(*pacc));
-	return pacc;
+	return malloc(sizeof(struct pci_access));
 }
 
 void pci_init(struct pci_access *pacc)