Remove fatal typo

Author: dpiparo

root/treeformula/stl/Makefile

@@ -45,7 +45,7 @@ endif
 #  directory.
 
 ifeq ($(strip $(ROOTTEST_HOME)),)
-   export ROOTTEST_HOME := $(shell git rev-parse --show-toplevel)
+   export ROOTTEST_HOME := $(shell git rev-parse --show-toplevel)/
    ifeq ($(strip $(ROOTTEST_HOME)),)
       export ROOTTEST_HOME := $(shell expr $(CURDIR) : '\(.*/roottest/\)')
    endif