perf callchain: Fixup parameter handling error message

Fix up parse_callchain_record_opt error message for 'fp', in the past using '-g
fp' was a valid alternative to '--call-graph fp', which is not the case since:

commit 09b0fd45ff63413df94cbd832a765076b201edbb
Author: Jiri Olsa <[e-mail]>
Date: Sat Oct 26 16:25:33 2013 +0200

perf record: Split -g and --call-graph

I.e. -g means "use the configured unwind data collection method" which has as
default 'fp', while --call-graph requires passing the method to use.

Signed-off-by: Kan Liang <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
[ split this from a larger patch related to LBR based unwinding ]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/callchain.c

···
 				ret = 0;
 			} else
 				pr_err("callchain: No more arguments "
-				       "needed for -g fp\n");
+				       "needed for --call-graph fp\n");
 			break;
 
 #ifdef HAVE_DWARF_UNWIND_SUPPORT