fixes for funcs without returns

R=ken
OCL=15170
CL=15170

src/lib/flag.go

@@ -144,9 +144,7 @@ func (b *BoolValue) Str() string {
 	if b.val {
 		return "true"
 	}
-	else {
-		return "false"
-	}
+	return "false"
 }
 
 func NewBoolValue(b bool, p *bool) *BoolValue {

src/lib/math/hypot.go

@@ -49,4 +49,5 @@ hypot(p, q float64) float64
 		q = q*r;
 		r = q/p;
 	}
+	panic("unreachable")
 }

src/lib/math/pow.go

@@ -62,4 +62,5 @@ pow(arg1,arg2 float64) float64
 		}
 		arg1 *= arg1;
 	}
+	panic("unreachable")
 }

src/lib/os/os_error.go

@@ -70,7 +70,6 @@ const NoError = "No Error"
 func (e *Error) String() string {
 	if e == nil {
 		return NoError
-	} else {
-		return e.s
 	}
+	return e.s
 }

test/chan/powser1.go

@@ -382,7 +382,7 @@ func Monmul(U PS, n int) PS{
 // Multiply by x
 
 func Xmul(U PS) PS{
-	Monmul(U,1);
+	return Monmul(U,1);
 }
 
 func Rep(c *rat) PS{

test/fixedbugs/bug028.go

@@ -16,6 +16,7 @@ func Alloc(i int) int {
 	case 10:
 		return 10;
 	}
+	return 0
 }
 
 func main() {

test/golden.out

@@ -226,5 +226,8 @@ fixedbugs/bug073.go:9: illegal types for operand: RSH
 =========== fixedbugs/bug081.go
 fixedbugs/bug081.go:5: syntax error
 
+=========== fixedbugs/bug086.go
+fixedbugs/bug086.go:5: function ends without a return statement
+
 =========== fixedbugs/bug091.go
 fixedbugs/bug091.go:14: label exit not defined