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stdio: fix putc(), plan9 version

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

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

@@ -92,7 +92,7 @@

 #define	getchar()	getc(stdin)

 char *gets(char *);

 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))

 int _IO_putc(int, FILE *);

 int putchar(int);

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