tracing: Merge seq_print_sym_short() and seq_print_sym_offset()

These two functions are nearly identical, so we can avoid some code
duplication by moving the conditional into a common implementation.

Link: http://lkml.kernel.org/r/20181029223542.26175-2-linux@rasmusvillemoes.dk



Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>