[PATCH] scripts: coccicheck: Correct usage of make coccicheck

[Sumera Priyadarsini]

The command "make coccicheck C=1 CHECK=scripts/coccicheck" results in the
error:
        ./scripts/coccicheck: line 65: -1: shift count out of range

This happens because every time the C variable is specified,
the shell arguments need to be "shifted" in order to take only
the last argument, which is the C file to test. These shell arguments
mostly comprise flags that have been set in the Makefile. However,
when coccicheck is specified in the make command as a rule, the
number of shell arguments is zero, thus passing the invalid value -1
to the shift command, resulting in an error.

Modify coccicheck to print correct usage of make coccicheck so as to
avoid the error.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@xxxxxxxxx>
---
 scripts/coccicheck | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/scripts/coccicheck b/scripts/coccicheck
index 209bb0427b43..b990c8a60a94 100755
--- a/scripts/coccicheck
+++ b/scripts/coccicheck
@@ -63,6 +63,18 @@ if [ "$C" = "1" -o "$C" = "2" ]; then
 
     # Take only the last argument, which is the C file to test
     shift $(( $# - 1 ))
+    err=$?
+    if [[ $err -ne 0 ]]; then
+	    echo ''
+	    echo 'Specifying both the variable "C" and rule "coccicheck" in the make
+command results in a shift count error.'
+	    echo ''
+	    echo 'Try specifying "scripts/coccicheck" as a value for the CHECK variable instead.'
+	    echo ''
+	    echo 'Example:	make C=2 CHECK=scripts/coccicheck drivers/staging/wfx/hi_t.o'
+	    echo ''
+	    exit 1
+    fi
     OPTIONS="$COCCIINCLUDE $1"
 
     # No need to parallelize Coccinelle since this mode takes one input file.
-- 
2.25.1