[vte] parser: cat: Fix clang build error

[Ting-Wei Lan <lantw src gnome org>]

commit ecb62ea5a5b24a5bff38356ab3575b1d9852938b
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sun Nov 18 23:09:45 2018 +0800

    parser: cat: Fix clang build error
    
    seq.param returns int, so param should not be declared as unsigned int.

 src/parser-cat.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/parser-cat.cc b/src/parser-cat.cc
index 6be96ed6..9ba4e214 100644
--- a/src/parser-cat.cc
+++ b/src/parser-cat.cc
@@ -521,7 +521,7 @@ private:
         {
                 auto const sgr = seq.param(idx);
 
-                unsigned int param = 1;
+                int param = 1;
                 /* If we have a subparameter, get it */
                 if (seq.param_nonfinal(idx))
                         param = seq.param(idx + 1);