omgps: omgps fails compilation due to uninitialized variables

omgps does not compile with gcc 4.9 due to uninitialized variables 
with the option -Werror=maybe-uninitialized
To solve the problem, just initiated the variable and checked for side
effects.
Upstream-Status: Submitted
+https://code.google.com/p/omgps/issues/detail?id=16

Signed-off-by: Raphael Silva <rapphil@gmail.com>
diff -urpN omgps.orig/src/sound.c omgps/src/sound.c
--- omgps.orig/src/sound.c	2014-12-14 15:13:29.609243994 -0200
+++ omgps/src/sound.c	2014-12-14 15:14:13.831116745 -0200
@@ -44,7 +44,7 @@ static gboolean play_sound_files(char *f
 		return FALSE;
 
 	char *bak = strdup(files);
-	char *saveptr;
+	char *saveptr = NULL;
 	char *p = strtok_r(bak, ";", &saveptr);
 
 	#define MAX_SOUND_FILES 14