tools/kernel2minor: fix permissions of created files

Signed-off-by: Felix Fietkau <nbd@nbd.name>

tools/kernel2minor/patches/120-fix_create_mode.patch

@@ -0,0 +1,11 @@
+--- a/kernel2minor.c
++++ b/kernel2minor.c
+@@ -622,7 +622,7 @@ int main(int argc, char *argv[]){
+     perror("Can't open kernel file");
+     exit(-1);
+   }
+-  r = creat(res_file, 0);
++  r = open(res_file, O_CREAT | O_TRUNC | O_WRONLY, 0644);
+   if(r <= 0){
+     perror("Can't create result file");
+     close(k);