fix "warning: ISO C90 forbids mixed declarations and code"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index 40f971d..3f22334 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -96,8 +96,9 @@
 			 || hasmntopt(m, MNTOPT_NOAUTO) == NULL
 			) {
 #if ENABLE_FEATURE_SWAPON_PRI
+				char *p;
 				g_flags = 0; /* each swap space might have different flags */
-				char *p = hasmntopt(m,"pri");
+				p = hasmntopt(m, "pri");
 				if (p) {
 					/* Max allowed 32767 (==SWAP_FLAG_PRIO_MASK) */
 					unsigned int swap_prio = MIN(bb_strtou(p + 4 , NULL, 10), SWAP_FLAG_PRIO_MASK);