remove unused variable

lab2/datalab-handout/bits.c

@@ -323,7 +323,7 @@ int howManyBits(int x) {
   int rs1 = rs2r >> 1;
   int bits1_flag = (!!(rs1) << 31) >> 31; // 0xfffffff if not 0
   int bits1 = 1;
-  int rs1r = (bits1_flag & rs1) | ((~bits1_flag) & rs2r); // rs1, if rs1 not 0, rs2 if rs1 0
+  //int rs1r = (bits1_flag & rs1) | ((~bits1_flag) & rs2r); // rs1, if rs1 not 0, rs2 if rs1 0
   int b1 = bits1_flag & bits1;
 
   int is0orneg1 = (!(x ^ (0))) | (!(x ^((1<<31)>>31)));