Use generic unlocking infrastructure for SPI chips

Actually check if the unlock worked instead of just assuming it worked.

Corresponding to flashrom svn r1082.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
diff --git a/chipdrivers.h b/chipdrivers.h
index ca3b190..3a9c611 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -47,7 +47,7 @@
 int spi_chip_write_256_new(struct flashchip *flash, uint8_t *buf, int start, int len);
 int spi_chip_read(struct flashchip *flash, uint8_t *buf, int start, int len);
 uint8_t spi_read_status_register(void);
-int spi_disable_blockprotect(void);
+int spi_disable_blockprotect(struct flashchip *flash);
 int spi_byte_program(int addr, uint8_t databyte);
 int spi_nbyte_program(int addr, uint8_t *bytes, int len);
 int spi_nbyte_read(int addr, uint8_t *bytes, int len);