whitespace fixes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/shell_common.c b/shell/shell_common.c
index e9effd2..f02ed81 100644
--- a/shell/shell_common.c
+++ b/shell/shell_common.c
@@ -368,9 +368,9 @@
 #endif
 	/* optarg = NULL; opterr = 0; optopt = 0; - do we need this?? */
 
-        argc = 1;
-        while (argv[argc])
-                argc++;
+	argc = 1;
+	while (argv[argc])
+		argc++;
 
 	opts = 0;
 	while (1) {