Use explicit non-char opt for --zero-super

As we don't allow '-K' for '--zero-super' there is no point
using it internally.  Just define a 'KillOpt' like with
other options.

Signed-off-by: NeilBrown <neilb@suse.de>

ReadMe.c

@@ -86,7 +86,7 @@ struct option long_options[] = {
     {"follow",    0, 0, 'F'},
     {"grow",      0, 0, 'G'},
     {"incremental",0,0, 'I'},
-    {"zero-superblock", 0, 0, 'K'}, /* deliberately not a short_option */
+    {"zero-superblock", 0, 0, KillOpt}, /* deliberately not a short_option */
     {"query",	  0, 0, 'Q'},
     {"examine-bitmap", 0, 0, 'X'},
     {"auto-detect", 0, 0, AutoDetect},

mdadm.c

@@ -252,7 +252,7 @@ int main(int argc, char *argv[])
 		case KillSubarray:
 		case UpdateSubarray:
 		case UdevRules:
-		case 'K':
+		case KillOpt:
 			if (!mode)
 				newmode = MISC;
 			break;
@@ -932,7 +932,7 @@ int main(int argc, char *argv[])
 		case O(MISC,'Q'):
 		case O(MISC,'D'):
 		case O(MISC,'E'):
-		case O(MISC,'K'):
+		case O(MISC,KillOpt):
 		case O(MISC,'R'):
 		case O(MISC,'S'):
 		case O(MISC,'X'):
@@ -1562,7 +1562,7 @@ int main(int argc, char *argv[])
 						     brief?1+verbose:0,
 						     export, test, homehost, prefer);
 					continue;
-				case 'K': /* Zero superblock */
+				case KillOpt: /* Zero superblock */
 					if (ss)
 						rv |= Kill(dv->devname, ss, force, quiet,0);
 					else {

mdadm.h

@@ -323,6 +323,7 @@ enum special_options {
 	Continue,
 	OffRootOpt,
 	Prefer,
+	KillOpt,
 };
 
 /* structures read from config file */