libgo: fix typo in mksysinfo.sh script

Fix a small typo in the mksysinfo.sh script (incorrect input
    file for a grep command).
    
    Reviewed-on: https://go-review.googlesource.com/98635

From-SVN: r258259

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-262d629b1592f681fef396166a671e46cdb31230
+3287064c24cbf0c50776cdb87a720d29130b4363
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/mksysinfo.sh

@@ -1142,7 +1142,7 @@ grep '^const _RLIM_' gen-sysinfo.go |
     sed -e 's/^\(const \)_\(RLIM_[^= ]*\)\(.*\)$/\1\2 = _\2/' >> ${OUT}
 if test "${rlimit}" = "_rlimit64" && grep '^const _RLIM64_INFINITY ' gen-sysinfo.go > /dev/null 2>&1; then
   echo 'const RLIM_INFINITY = _RLIM64_INFINITY' >> ${OUT}
-elif grep '^const _RLIM_INFINITY ' gen-sysinfo-go; then
+elif grep '^const _RLIM_INFINITY ' gen-sysinfo.go > /dev/null 2>&1; then
   echo 'const RLIM_INFINITY = _RLIM_INFINITY' >> ${OUT}
 fi