libflash: fix memory leak on flash_exit()

LeakSanitizer caught this with libflash/test/test-flash.c:

Direct leak of 4096 byte(s) in 1 object(s) allocated from:
    #0 0x7f72546ee850 in malloc (/lib64/libasan.so.4+0xde850)
    #1 0x405ff0 in flash_init libflash/test/../libflash.c:830
    #2 0x408632 in main libflash/test/test-flash.c:382
    open-power#3 0x7f7253540509 in __libc_start_main (/lib64/libc.so.6+0x20509)

Signed-off-by: Stewart Smith <[email protected]>

Author: stewartsmith

libflash/libflash.c

@@ -863,8 +863,11 @@ int flash_init(struct spi_flash_ctrl *ctrl, struct blocklevel_device **bl,
 void flash_exit(struct blocklevel_device *bl)
 {
 	/* XXX Make sure we are idle etc... */
-	if (bl)
-		free(container_of(bl, struct flash_chip, bl));
+	if (bl) {
+		struct flash_chip *c = container_of(bl, struct flash_chip, bl);
+		free(c->smart_buf);
+		free(c);
+	}
 }
 
 void flash_exit_close(struct blocklevel_device *bl, void (*close)(struct spi_flash_ctrl *ctrl))