Staging: rtl8723bs: fix spaces in basic_types.h

This commit fixes the following checkpatch.pl error:

    ERROR:POINTER_LOCATION: "(foo*)" should be "(foo *)"
    torvalds#16: FILE: ./include/basic_types.h:16:
    +#define FIELD_OFFSET(s, field)	((__kernel_ssize_t)&((s*)(0))->field)

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marco Cesati <marcocesati@gmail.com>
Link: https://lore.kernel.org/r/20210315170618.2566-40-marcocesati@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Marco Cesati

drivers/staging/rtl8723bs/include/basic_types.h

@@ -13,7 +13,7 @@
 
 #include <linux/types.h>
 
-#define FIELD_OFFSET(s, field)	((__kernel_ssize_t)&((s*)(0))->field)
+#define FIELD_OFFSET(s, field)	((__kernel_ssize_t)&((s *)(0))->field)
 
 #define SIZE_PTR __kernel_size_t
 #define SSIZE_PTR __kernel_ssize_t