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[lib/c] Fix value returned in __getc() and __putc()

--- a/lib/c/__getc.c

+++ b/lib/c/__getc.c

@@ -25,7 +25,7 @@

 	if (fp->buf == NULL) {

 		if ((fp->buf = malloc(BUFSIZ)) == NULL) {

 			errno = ENOMEM;

-			return NULL;

+			return EOF;

 		}

 		fp->flags |= _IOALLOC;

 	}

--- a/lib/c/__putc.c

+++ b/lib/c/__putc.c

@@ -48,7 +48,7 @@

 	if (fp->buf == NULL) {

 		if ((fp->buf = malloc(BUFSIZ)) == NULL) {

 			errno = ENOMEM;

-			return NULL;

+			return EOF;

 		}

 		fp->flags |= _IOALLOC;

 	}