Index: trunk/src/hid_cam.c
===================================================================
--- trunk/src/hid_cam.c	(revision 27884)
+++ trunk/src/hid_cam.c	(revision 27885)
@@ -118,8 +118,10 @@
 			res = "topmask";
 		else if (flags & PCB_LYT_PASTE)
 			res = "toppaste";
-		else if (purpose != NULL)
-			pcb_snprintf(res = buf, sizeof(buf), "top-%s", purpose);
+		else if (purpose != NULL) {
+			pcb_snprintf(buf, sizeof(buf), "top-%s", purpose);
+			res = buf;
+		}
 		else
 			res = "top";
 	}
@@ -132,8 +134,10 @@
 			res = "bottommask";
 		else if (flags & PCB_LYT_PASTE)
 			res = "bottompaste";
-		else if (purpose != NULL)
-			pcb_snprintf(res = buf, sizeof(buf), "bottom-%s", purpose);
+		else if (purpose != NULL) {
+			pcb_snprintf(buf, sizeof(buf), "bottom-%s", purpose);
+			res = buf;
+		}
 		else
 			res = "bottom";
 	}