n_gsm: Use print_hex_dump_bytes
Use the standard mechanism to print a hex buffer
to eliminate empty printf warning.
A couple % smaller text and data too.
$ size drivers/tty/n_gsm.o*
text data bss dec hex filename
23543 312 6376 30231 7617 drivers/tty/n_gsm.o.new
24051 408 6496 30955 78eb drivers/tty/n_gsm.o.old
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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