[Offload] Fix typo on -Xoffload-linker

Author: jhuber6

offload/test/lit.cfg

@@ -207,7 +207,7 @@ def add_libraries(source):
                "-Xoffload-linker -lm " + \
                "-Xoffload-linker -lompdevice"
     else:
-        return source + " " + "-Xoffload-lnker -lompdevice"
+        return source + " " + "-Xoffload-linker -lompdevice"
 
 # substitutions
 # - for targets that exist in the system create the actual command.