[sdf, sfnt] Handle minor compiler warnings.

* src/sdf/ftsdf.c (get_min_distance_conic): Initialize `nearest_point`.

* src/sfnt/ttsvg.c (find_doc): Initialize `mid_doc`.

Fixes #1195.

src/sdf/ftsdf.c

@@ -2109,7 +2109,8 @@
     FT_Error  error = FT_Err_Ok;
 
     FT_26D6_Vec  aA, bB;         /* A, B in the above comment             */
-    FT_26D6_Vec  nearest_point;  /* point on curve nearest to `point`     */
+    FT_26D6_Vec  nearest_point = { 0, 0 };
+                                 /* point on curve nearest to `point`     */
     FT_26D6_Vec  direction;      /* direction of curve at `nearest_point` */
 
     FT_26D6_Vec  p0, p1, p2;     /* control points of a conic curve       */
@@ -2405,7 +2406,8 @@
     FT_Error  error = FT_Err_Ok;
 
     FT_26D6_Vec  aA, bB, cC;     /* A, B, C in the above comment          */
-    FT_26D6_Vec  nearest_point;  /* point on curve nearest to `point`     */
+    FT_26D6_Vec  nearest_point = { 0, 0 };
+                                 /* point on curve nearest to `point`     */
     FT_26D6_Vec  direction;      /* direction of curve at `nearest_point` */
 
     FT_26D6_Vec  p0, p1, p2;     /* control points of a conic curve       */

src/sfnt/ttsvg.c

@@ -207,7 +207,7 @@
     FT_Error  error;
 
     Svg_doc  start_doc;
-    Svg_doc  mid_doc;
+    Svg_doc  mid_doc = { 0, 0, 0, 0 }; /* pacify compiler */
     Svg_doc  end_doc;
 
     FT_Bool  found = FALSE;