fix typos "wich" -> "which"

Signed-off-by: Uwe Zeisberger <zeisberg@informatik.uni-freiburg.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index bf96a61..9a3ec20 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -4,7 +4,7 @@
 #
 # Stage one of module building created the following:
 # a) The individual .o files used for the module
-# b) A <module>.o file wich is the .o files above linked together
+# b) A <module>.o file which is the .o files above linked together
 # c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
 #    the preliminary <module>.o file, plus all .o files