* printcmd.c: Coding style fixes: add missing spaces in comments

* printcmd.c: Coding style fixes: add missing spaces in comments
and wrapping long lines.
(delete_display, enable_display_command, disable_display_command)
(printf_command, display_info, undisplay_command, free_display)
(display_command, x_command, address_info, set_command)
(inspect_command, call_command, print_command, print_command_1)
(validate_format, print_formatted, decode_format, sym_format):
Remove prototypes.
(x_command): Make static.
(printf_command): Convert error into internal consistency check.
(address_info): Avoid assignment within function call.
(printf_command): Avoid redundant cast.
* tracepoint.c (x_command): Remove extern prototype.