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5255 uts shouldn't open-code ISP2

@@ -2136,11 +2136,11 @@
          * Firmware needs the big buff size as a power of 2.  Lie and
          * tell him the buffer is larger, because we only use 1
          * buffer/pkt, and the mtu will prevent overruns
          */
         big_pow2 = myri10ge_mtu + MXGEFW_PAD;
-        while ((big_pow2 & (big_pow2 - 1)) != 0)
+        while (!ISP2(big_pow2))
                 big_pow2++;
 
         /* now give firmware buffers sizes, and MTU */
         cmd.data0 = myri10ge_mtu;
         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_MTU, &cmd);

@@ -5435,11 +5435,11 @@
          * slices. We give up on MSI-X if we can only get a single
          * vector.
          */
         while (mgp->num_slices > 1) {
                 /* make sure it is a power of two */
-                while (mgp->num_slices & (mgp->num_slices - 1))
+                while (!ISP2(mgp->num_slices))
                         mgp->num_slices--;
                 if (mgp->num_slices == 1)
                         return (0);
 
                 status = myri10ge_add_intrs(mgp, 0);