good grief, fix this little tool's memory management.

was using malloc to allocate and bu_free to release, yikes.  switched to bu.

src/util/pixmorph.c

@@ -480,26 +480,13 @@ main(int argc, char **argv)
     }
 
     /* Allocate memory for our bag o' pixels. */
-
-    pa = (unsigned char *)malloc(pa_width*pa_height*3);
-    pb = (unsigned char *)malloc(pa_width*pa_height*3);
-    wa = (unsigned char *)malloc(pa_width*pa_height*3);
-    wb = (unsigned char *)malloc(pa_width*pa_height*3);
-    morph = (unsigned char *)malloc(pa_width*pa_height*3);
-
-    if (pa == NULL || pb == NULL || wa == NULL ||  wb == NULL ||
-	morph == NULL) {
-	fprintf(stderr, "pixmorph: memory allocation failure\n");
-	bu_free(pa, "pa alloc from malloc");
-	bu_free(pb, "pb alloc from malloc");
-	bu_free(wa, "wa alloc from malloc");
-	bu_free(wb, "wb alloc from malloc");
-	bu_free(morph, "morph alloc from malloc");
-	return 1;
-    }
+    pa = (unsigned char *)bu_malloc(pa_width*pa_height*3, "pa");
+    pb = (unsigned char *)bu_malloc(pa_width*pa_height*3, "pb");
+    wa = (unsigned char *)bu_malloc(pa_width*pa_height*3, "wa");
+    wb = (unsigned char *)bu_malloc(pa_width*pa_height*3, "wb");
+    morph = (unsigned char *)bu_malloc(pa_width*pa_height*3, "morph");
 
     /* The following is our memorizing table for weight calculation. */
-
     for (i = 0; i < MAXLEN; i++)
 	weightlookup[i] = -1.0;
 
@@ -521,7 +508,7 @@ main(int argc, char **argv)
     /* Process the lines file. */
 
     lines_headerinfo(linesfile, &a, &b, &p, &numlines);
-    lines = (struct lineseg *)malloc(numlines * sizeof(struct lineseg));
+    lines = (struct lineseg *)bu_malloc(numlines * sizeof(struct lineseg), "lines");
     numlines = lines_read(linesfile, numlines, lines,
 			  pa_width, pa_height, warpfrac, p*b);
     fprintf(stderr, "pixmorph: %ld line segments read\n", numlines);
@@ -548,7 +535,13 @@ main(int argc, char **argv)
 
     fprintf(stderr, "pixmorph: Morph complete.\n");
 
-    /* System takes care of memory deallocation. */
+    /* memory deallocation. */
+    bu_free(pa, "pa");
+    bu_free(pb, "pb");
+    bu_free(wa, "wa");
+    bu_free(wb, "wb");
+    bu_free(morph, "morph");
+    bu_free(lines, "lines");
 
     return 0;
 }