FIX: REBNATIVE(browse) should trap on OS_BROWSE failure, not success.

Author: 0branch

src/core/n-io.c

@@ -513,11 +513,7 @@ static REBSER *Read_All_File(char *fname)
 
 	r = OS_BROWSE(url, 0);
 
-	if (r == 0) {
-		return R_UNSET;
-	} else {
-		Trap1(RE_CALL_FAIL, Make_OS_Error(r));
-	}
+	if (r == 0) Trap1(RE_CALL_FAIL, Make_OS_Error(r));
 
 	return R_UNSET;
 }