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ape: fix stdio putc() macro, avoiding "result of operation not used" warning

moving _IO_CHMASK masking on the right hand side fixes it.

--- a/sys/include/ape/stdio.h

+++ b/sys/include/ape/stdio.h

@@ -112,7 +112,7 @@

 #define	getchar()	getc(stdin)

 extern char *gets(char *);

 extern int putc(int, FILE *);

-#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(f)->wp++=c)&_IO_CHMASK)

+#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(f)->wp++=(c)&_IO_CHMASK))

 extern int _IO_putc(int, FILE *);

 extern int putchar(int);

 #define	putchar(c)	putc(c, stdout)