win32: (another) fix to file extension test

It turns out '.bat' is a valid batch file name.  Reduce the
permitted length for filenames to allow for this.

Also, actually *use* the file basename in the test this time.

1 files changed, 1 insertions, 1 deletions

diff --git a/win32/mingw.c b/win32/mingw.c
index 3398e3df4..da77dee36 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -1167,7 +1167,7 @@ static int has_win_suffix(const char *name, int start)
         const char *bname = bb_basename(name);
         int i, len = strlen(bname);
 
-        if (len > 4 && name[len-4] == '.') {
+        if (len > 3 && bname[len-4] == '.') {
                 for (i=start; i<4; ++i) {
                         if (!strcasecmp(bname+len-3, win_suffix[i])) {
                                 return 1;