Makefile fix and vol_perc fix for mute

Makefile

@@ -4,7 +4,7 @@ include config.mk
 
 all: slstatus
 
-slstatus: config.h config.mk
+slstatus: slstatus.c config.h config.mk
 	${CC} ${CFLAGS} -o $@ slstatus.c ${LDFLAGS}
 
 config.h:

slstatus.c

@@ -658,9 +658,7 @@ vol_perc(const char *card)
 	}
 
 	close(afd);
-	if (v == 0) {
-		return smprintf("mute");
-	}
+
 	return smprintf("%d%%", v & 0xff);
 }