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[lib/c] Fix precedence order in fopen.c

The lack of parentheses was making the evaluation wrong.

--- a/lib/c/fopen.c

+++ b/lib/c/fopen.c

@@ -12,7 +12,7 @@

 	FILE *fp;

 	for (fp = __iob; fp < &__iob[FOPEN_MAX]; ++fp) {

-		if (fp->flags & (_IOREAD | _IOWRITE | _IORW) == 0)

+		if ((fp->flags & (_IOREAD | _IOWRITE | _IORW)) == 0)

 			break;

 	}

 	if (fp == &__iob[FOPEN_MAX]) {