Fixed warning 'uninitialized value in numeric gt'.

This is a MSYS/MinGW-only warning; full warning text is:
Use of uninitialized value in numeric gt (>) at ../../curl/tests/runtests.pl line 2227.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/runtests.pl b/tests/runtests.pl
index ddda76f1c..ee2f30873 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -2206,7 +2206,7 @@ sub checksystem {
                 # given path to the "actual" windows path.
 
                 my @m = `mount`;
-                my $matchlen;
+                my $matchlen = 0;
                 my $bestmatch;
                 my $mount;