net/mac8390: discard unnecessary breaks

The 'break' is unnecessary because of previous 'return',
and we could discard it.
Signed-off-by: NZhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201027135159.71444-1-zhangqilong3@huawei.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/8390/mac8390.c

@@ -175,7 +175,6 @@ static enum mac8390_type mac8390_ident(struct nubus_rsrc *fres)
 		default:
 			return MAC8390_APPLE;
 		}
-		break;
 
 	case NUBUS_DRSW_APPLE:
 		switch (fres->dr_hw) {
@@ -186,11 +185,9 @@ static enum mac8390_type mac8390_ident(struct nubus_rsrc *fres)
 		default:
 			return MAC8390_APPLE;
 		}
-		break;
 
 	case NUBUS_DRSW_ASANTE:
 		return MAC8390_ASANTE;
-		break;
 
 	case NUBUS_DRSW_TECHWORKS:
 	case NUBUS_DRSW_DAYNA2:
@@ -199,11 +196,9 @@ static enum mac8390_type mac8390_ident(struct nubus_rsrc *fres)
 			return MAC8390_CABLETRON;
 		else
 			return MAC8390_APPLE;
-		break;
 
 	case NUBUS_DRSW_FARALLON:
 		return MAC8390_FARALLON;
-		break;
 
 	case NUBUS_DRSW_KINETICS:
 		switch (fres->dr_hw) {
@@ -212,7 +207,6 @@ static enum mac8390_type mac8390_ident(struct nubus_rsrc *fres)
 		default:
 			return MAC8390_KINETICS;
 		}
-		break;
 
 	case NUBUS_DRSW_DAYNA:
 		/*
@@ -224,7 +218,6 @@ static enum mac8390_type mac8390_ident(struct nubus_rsrc *fres)
 			return MAC8390_NONE;
 		else
 			return MAC8390_DAYNA;
-		break;
 	}
 	return MAC8390_NONE;
 }