[MIPS] gth2.c: Fix a warning on gth2 build.

gth2.c: In function 'misc_init_r':
gth2.c:434: warning: pointer targets in passing argument 2 of 'setenv' differ in signedness

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
1 file changed