Fix gcc -Wall warnings, especially on 64-bit systems

Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/resize/main.c b/resize/main.c
index f9d8b84..7db4ebc 100644
--- a/resize/main.c
+++ b/resize/main.c
@@ -348,7 +348,7 @@
 	}
 
 	if (use_stride >= 0) {
-		if (use_stride >= fs->super->s_blocks_per_group) {
+		if (use_stride >= (int) fs->super->s_blocks_per_group) {
 			com_err(program_name, 0, 
 				_("Invalid stride length"));
 			exit(1);