Add -c short-hand in clamdscan help and man

clamdscan/clamdscan.c

@@ -242,7 +242,7 @@ void help(void)
     mprintf(LOGG_INFO, "    --remove                           Remove infected files. Be careful!\n");
     mprintf(LOGG_INFO, "    --move=DIRECTORY                   Move infected files into DIRECTORY\n");
     mprintf(LOGG_INFO, "    --copy=DIRECTORY                   Copy infected files into DIRECTORY\n");
-    mprintf(LOGG_INFO, "    --config-file=FILE                 Read configuration from FILE.\n");
+    mprintf(LOGG_INFO, "    --config-file=FILE    -c           Read configuration from FILE.\n");
 #ifdef _WIN32
     mprintf(LOGG_INFO, "    --memory                           Scan loaded executable modules\n");
     mprintf(LOGG_INFO, "    --kill                             Kill/Unload infected loaded modules\n");

docs/man/clamdscan.1.in

@@ -27,7 +27,7 @@ Be quiet \- only output error messages.
 \fB\-\-stdout\fR
 Write all messages (except for libclamav output) to the standard output (stdout).
 .TP
-\fB\-\-config\-file=FILE\fR
+\fB\-c, \-\-config\-file=FILE\fR
 Read clamd settings from FILE.
 .TP
 \fB\-l FILE, \-\-log=FILE\fR