The if branch is completely unnecessary since 'realloc' can handle
NULL pointers for the first parameter.

This patch is just an adoption of Ulrich Drepper's recent patch on
perf tools.
Signed-off-by: NNamhyung Kim <namhyung.kim@lge.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/r/1335230984-7613-1-git-send-email-namhyung.kim@lge.comSigned-off-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NNamhyung Kim <namhyung@kernel.org>