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[lib/c] Don't compare char with EOF

The type of the pointer is unsigned char, so it cannot be EOF
ever.

--- a/lib/c/fread.c

+++ b/lib/c/fread.c

@@ -8,6 +8,7 @@

 {

 	unsigned char *bp = ptr;

 	size_t n, i;

+	int c;

 	if (size == 0)

 		return 0;

@@ -15,8 +16,9 @@

 	for (n = 0; n < nmemb; n++) {

 		i = size;

 		do {

-			if ((*bp++ = getc(fp)) == EOF)

+			if ((c = getc(fp)) == EOF)

 				return n;

+			*bp++ = c;

 		} while (--i);

 	}