vppinfra: correct clib_bitmap_set() return comment
Fix a copy-n-paste issue that left clib_bitmap_set()'s return
type documentation incorrect.  Chnage it to indicate that
the function returns a new pointer for the bitmap that could
be different due to a possible reallocation.
Type: docs
@@ -178,7 +178,7 @@ clib_bitmap_set_no_check (uword * a, uword i, uword new_value)
@param ai - pointer to the bitmap
@param i - the bit position to interrogate
@param value - new value for the bit
- @returns the old value of the bit
+ @returns the (possibly reallocated) bitmap object pointer
*/
always_inline uword *
clib_bitmap_set (uword * ai, uword i, uword value)
