scripts: merge_config: Fix typo in variable name.

${WARNOVERRIDE} was misspelled as ${WARNOVVERIDE}, which caused a shell
syntax error in certain paths of the script execution.

Fixes: 46dff8d7 ("scripts: merge_config: Add option to suppress warning on overrides")
Signed-off-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/merge_config.sh

@@ -145,7 +145,7 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
 		NEW_VAL=$(grep -w $CFG $MERGE_FILE)
 		BUILTIN_FLAG=false
 		if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] && [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
-			${WARNOVVERIDE} Previous  value: $PREV_VAL
+			${WARNOVERRIDE} Previous  value: $PREV_VAL
 			${WARNOVERRIDE} New value:       $NEW_VAL
 			${WARNOVERRIDE} -y passed, will not demote y to m
 			${WARNOVERRIDE}