Linux: drop preconditions for free_and_xStrdup()

free_and_xStrdup() internally skips the strdup() allocation if both
strings exist are are the same.  Drop such conditions prior of a call.

linux/LinuxProcessTable.c

@@ -985,9 +985,6 @@ static void LinuxProcessTable_readSecattrData(LinuxProcess* process, openat_arg_
 
    Row_updateFieldWidth(SECATTR, strlen(buffer));
 
-   if (process->secattr && String_eq(process->secattr, buffer)) {
-      return;
-   }
    free_and_xStrdup(&process->secattr, buffer);
 }
 
@@ -1008,9 +1005,6 @@ static void LinuxProcessTable_readCwd(LinuxProcess* process, openat_arg_t procFd
 
    pathBuffer[r] = '\0';
 
-   if (process->super.procCwd && String_eq(process->super.procCwd, pathBuffer))
-      return;
-
    free_and_xStrdup(&process->super.procCwd, pathBuffer);
 }