rfkill: do not ignore read error

Read error should be impossible, but when one does happen user certainly
wants to know about that rather than see even more strange issue caused
random data in name variable.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

sys-utils/rfkill.c

@@ -132,7 +132,11 @@ static const char *get_name(uint32_t idx)
 		return NULL;
 	}
 
-	read(fd, name, sizeof(name) - 1);
+	if (read(fd, name, sizeof(name) - 1) < 0) {
+		warn(_("cannot read %s"), filename);
+		close(fd);
+		return NULL;
+	}
 
 	pos = strchr(name, '\n');
 	if (pos)