pci: fix: use int instead of uint32 as return error for pci_enum

Author: rizlik

include/pci.h

@@ -118,6 +118,7 @@ uint8_t pci_config_read8(uint8_t bus, uint8_t dev, uint8_t fun, uint8_t off);
 void pci_config_write8(uint8_t bus, uint8_t dev, uint8_t fun, uint8_t off,
                        uint8_t value);
 
+int pci_enum_bus(uint8_t bus, struct pci_enum_info *info);
 
 int pci_enum_do(void);
 int pci_pre_enum(void);

src/pci.c

@@ -721,7 +721,7 @@ static int pci_program_bridge(uint8_t bus, uint8_t dev, uint8_t fun,
     return -1;
 }
 
-uint32_t pci_enum_bus(uint8_t bus, struct pci_enum_info *info)
+int pci_enum_bus(uint8_t bus, struct pci_enum_info *info)
 {
     uint16_t header_type;
     uint32_t vd_code;