core: instead of cpp-style, use C-style comments

core/bitarithm.c

@@ -25,7 +25,7 @@
 
 unsigned bitarithm_msb(unsigned v)
 {
-    register unsigned r; // result of log2(v) will go here
+    register unsigned r; /* result of log2(v) will go here */
 
 #if ARCH_32_BIT
     register unsigned shift;
@@ -37,7 +37,7 @@ unsigned bitarithm_msb(unsigned v)
                                             r |= (v >> 1);
 #else
     r = 0;
-    while (v >>= 1) { // unroll for more speed...
+    while (v >>= 1) { /* unroll for more speed... */
         r++;
     }
 
@@ -48,10 +48,10 @@ unsigned bitarithm_msb(unsigned v)
 
 unsigned bitarithm_bits_set(unsigned v)
 {
-    unsigned c; // c accumulates the total bits set in v
+    unsigned c; /* c accumulates the total bits set in v */
 
     for (c = 0; v; c++) {
-        v &= v - 1; // clear the least significant bit set
+        v &= v - 1; /* clear the least significant bit set */
     }
 
     return c;