gdb: remove an unnecessary scope block in update_breakpoint_locations

gdb: remove an unnecessary scope block in update_breakpoint_locations

In update_breakpoint_locations there's a scope block which I don't
think adds any value.  There is one local defined within the scope,
the local is currently an 'int' but should be a 'bool', either way
there's no destructor being triggered when we exit the scope.

This commit changes the local to a 'bool', removes the unnecessary
scope, and re-indents the code.

Within the (now removed) scope was a `for' loop.  Inside the loop I
have converted this:

  for (....)
    {
      if (CONDITION)
        {
          /* Body */
        }
    }

to this:

  for (....)
    {
      if (!CONDITION)
        continue;

      /* Body */
    }

which means that the body doesn't need to be indented as much, making
things easier to read.

There should be no functional change after this commit.

Reviewed-By: Klaus Gerlicher <klaus.gerlicher@intel.com>