isdn: avm: Fix string plus integer warning from Clang

[ Upstream commit 7afa81c55fca0cad589722cb4bce698b4803b0e1 ]

A recent commit in Clang expanded the -Wstring-plus-int warning, showing
some odd behavior in this file.

drivers/isdn/hardware/avm/b1.c:426:30: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int]
                cinfo->version[j] = "\0\0" + 1;
                                    ~~~~~~~^~~
drivers/isdn/hardware/avm/b1.c:426:30: note: use array indexing to silence this warning
                cinfo->version[j] = "\0\0" + 1;
                                           ^
                                    &      [  ]
1 warning generated.

This is equivalent to just "\0". Nick pointed out that it is smarter to
use "" instead of "\0" because "" is used elsewhere in the kernel and
can be deduplicated at the linking stage.

Link: https://github.com/ClangBuiltLinux/linux/issues/309
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/isdn/hardware/avm/b1.c b/drivers/isdn/hardware/avm/b1.c
index 4d9b195547c5cc253b827c7c6d79d036612e43f6..df2a10157720a8c3c13a1991b947b101014d7b54 100644 (file)
--- a/drivers/isdn/hardware/avm/b1.c
+++ b/drivers/isdn/hardware/avm/b1.c
@@ -423,7 +423,7 @@ void b1_parse_version(avmctrl_info *cinfo)
        int i, j;
 
        for (j = 0; j < AVM_MAXVERSION; j++)
-               cinfo->version[j] = "\0\0" + 1;
+               cinfo->version[j] = "";
        for (i = 0, j = 0;
             j < AVM_MAXVERSION && i < cinfo->versionlen;
             j++, i += cinfo->versionbuf[i] + 1)