Remove the unnecessary NULL fields in global instance definition of file_operations

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c

@@ -252,9 +252,6 @@ static const struct file_operations tc_fops =
   NULL,       /* truncate */
   NULL,       /* mmap */
   tc_poll     /* poll */
-#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
-  , NULL      /* unlink */
-#endif
 };
 
 /* If only a single touchscreen device is supported, then the driver state

boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c

@@ -184,9 +184,6 @@ static const struct file_operations g_lcdops =
   NULL,          /* truncate */
   NULL,          /* mmap */
   lcd_poll       /* poll */
-#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
-  , NULL         /* unlink */
-#endif
 };
 
 /* This is the driver state structure */