Revert "Do not suppress any shellcheck warnings"

This reverts commit 26664df.

The commit enabled the shellcheck warning SC2119 based on the
understanding that bash would pass arguments list "$@" from caller to
callee when functions are called without arguments. However, it was not
correct then merit of SC2119 is not so important. On the other hand,
SC2119 reports false positive warning when bash functions take optional
arguments and they are called without arguments.

Per discussion on the list [1], we concluded that the merit of optional
arguments is larger than that of SC2119. Hence, disable SC2119 again.

[1] https://lore.kernel.org/linux-nvme/o5xnqvujzakhrudv7p64owiuzgozmean6blxow4vdxhdqozg5v@qznf2tzmey7k/

Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: kawasaki

Makefile

@@ -13,7 +13,9 @@ install:
 	cp -R tests common $(dest)
 	$(MAKE) -C src dest=$(dest)/src install
 
-SHELLCHECK_EXCLUDE := ""
+# SC2119: "Use foo "$@" if function's $1 should mean script's $1". False
+# positives on helpers like _init_scsi_debug.
+SHELLCHECK_EXCLUDE := SC2119
 
 check:
 	shellcheck -x -e $(SHELLCHECK_EXCLUDE) -f gcc check new common/* \