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[libc] Initialize ch in fgets()

Signed-off-by: sin <sin@2f30.org>

--- a/lib/c/stdio/fgets.c

+++ b/lib/c/stdio/fgets.c

@@ -4,7 +4,7 @@

 char *

 fgets(char *s, int n, FILE *fp)

 {

-	int ch;

+	int ch = 0;

 	char *t = s;

 	while (--n > 0 && (ch = getc(fp)) != EOF) {