scripts: coccicheck: Avoid warning about spurious escape

e.g.
grep: warning: stray \ before -
Signed-off-by: Peter Foley <pefoley2@pefoley.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

scripts/coccicheck

@@ -18,7 +18,7 @@ fi
 SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')
 
 USE_JOBS="no"
-$SPATCH --help | grep "\-\-jobs" > /dev/null && USE_JOBS="yes"
+$SPATCH --help | grep -e "--jobs" > /dev/null && USE_JOBS="yes"
 
 # The verbosity may be set by the environmental parameter V=
 # as for example with 'make V=1 coccicheck'