r600c: add proper returns for some evergreen functions

these weren't checked anyway.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=29999

src/mesa/drivers/dri/r600/evergreen_fragprog.c

@@ -814,4 +814,7 @@ GLboolean evergreenSetupFPconstants(GLcontext * ctx)
         }
         unConstOffset += pCompiledSub->NumParameters;
     }
-}
+
+    return GL_TRUE;
+}
+

src/mesa/drivers/dri/r600/evergreen_vertprog.c

@@ -733,4 +733,7 @@ GLboolean evergreenSetupVPconstants(GLcontext * ctx)
         }
         unConstOffset += pCompiledSub->NumParameters;
     }
-}
+
+    return GL_TRUE;
+}
+