kernel/log_dump.c : Fix build error and warning
kernel/log_dump.c : Fix build error and warning

1. Build Error
log_dump/log_dump.c: In function 'log_dump_save':
log_dump/log_dump.c:135:18: error: storage size of 'mem' isn't known
  struct mallinfo mem;

2. Build Warning
log_dump/log_dump.c:63:1: warning: useless storage class specifier in empty declaration
 };

Signed-off-by: jeongchanKim <dd29dda359f9c9995ad03eb5d0e774929bcceb5c@samsung.com>

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