Change flashrom.c:map_flash_registers() from int to void

The function exit()s on failure, and no callers check the return value.

Corresponding to flashrom svn r396 and coreboot v2 svn r3901.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Peter Stuge <peter@stuge.se>
diff --git a/flash.h b/flash.h
index 00b4c80..a2ff912 100644
--- a/flash.h
+++ b/flash.h
@@ -481,7 +481,7 @@
 
 /* flashrom.c */
 void mmap_errmsg();
-int map_flash_registers(struct flashchip *flash);
+void map_flash_registers(struct flashchip *flash);
 
 /* layout.c */
 int show_id(uint8_t *bios, int size, int force);