[File] [patch] fix: use correct variable for ELF interpreter string

[Vincent Mihalkovic]

Hi,

I noticed that after commit 6bc6cf03ad4ad136088260e22f30c6d191c161a3
<https://github.com/file/file/commit/6bc6cf03ad4ad136088260e22f30c6d191c161a3>,
the ELF magic results have changed. Specifically, in the test data at
file-tests/db/elf <https://github.com/file/file-tests/tree/master/db/elf>,
the following difference occurs:

--- reference/elf/a.ref 2025-05-13 13:52:48.260986955 +0000
+++ /tmp/tmp.lcLqsYkBCU/out 2025-05-13 13:53:14.249232572 +0000
@@ -1 +1 @@
-ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked,
interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32,
BuildID[sha1]=f382d7105a1c1d2b42db80c4202ea7a84c59b335, not stripped
+ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked,
interpreter *empty*, for GNU/Linux 2.6.32,
BuildID[sha1]=f382d7105a1c1d2b42db80c4202ea7a84c59b335, not stripped
Upon reviewing the commit, I suspect a copy-paste mistake in the following
lines:
   else
-        strlcpy(interp, "*empty*", sizeof(interp));
+       str = "*empty*";
+ strlcpy(interp, "*empty*", sizeof(interp));

The strlcpy call should use the str variable as its source argument, not
the literal string "*empty*". The corrected code should be:
   else
-        strlcpy(interp, "*empty*", sizeof(interp));
+       str = "*empty*";
+ strlcpy(interp, str, sizeof(interp));

best regards,

Vincent Mihalkovic
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