Patch contributed by timeless@bemail.org

[Bug 334328] nsspkcs5_PKCS12PBE: Variable "A" tracked as NULL was dereferenced. r=nelson

security/nss/lib/softoken/lowpbe.c

@@ -546,6 +546,7 @@ loser:
 	PORT_FreeArena(arena, PR_TRUE);
     }
 
+    if (A) {
         /* if i != c, then we didn't complete the loop above and must of failed
          * somwhere along the way */
         if (i != c) {
@@ -554,6 +555,7 @@ loser:
         } else {
     	    A->len = bytesNeeded;
         }
+    }
     
     return A;
 }