pcu_l1_if: use proper format specifier for PCUIF version

Change-Id: Ibd15a678a7a8fc840422e2280b0d358138a67e0c
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 0712470..99d0927 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -496,8 +496,8 @@
 	int i;
 
 	if (info_ind->version != PCU_IF_VERSION) {
-		fprintf(stderr, "PCU interface version number of BTS (%d) is "
-			"different (%d).\nPlease re-compile!\n",
+		fprintf(stderr, "PCU interface version number of BTS (%u) is "
+			"different (%u).\nPlease re-compile!\n",
 			info_ind->version, PCU_IF_VERSION);
 		exit(-1);
 	}